Form N-Q

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM N-Q


QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number         811-21212         

        Nuveen Insured California Tax-Free Advantage Municipal Fund         
(Exact name of registrant as specified in charter)


        333 West Wacker Drive, Chicago, Illinois 60606         
(Address of principal executive offices) (Zip code)


Jessica R. Droeger—Vice President and Secretary
        333 West Wacker Drive, Chicago, Illinois 60606         
(Name and address of agent for service)

Registrant's telephone number, including area code:         312-917-7700        

Date of fiscal year end:            08/31          

Date of reporting period:         11/30/06         

Form N-Q is to be used by management investment companies, other than small business investment companies registered on Form N-5 (§§ 239.24 and 274.5 of this chapter), to file reports with the Commission, not later than 60 days after the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use the information provided on Form N-Q in its regulatory, disclosure review, inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-Q unless the Form displays a currently valid Office of Management and Budget (“OMB”) control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to the Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. § 3507.

Item 1. Schedule of Investments

    Portfolio of Investments (Unaudited)             
    Nuveen Insured California Tax-Free Advantage Municipal Fund (NKX)             
    November 30, 2006             
Principal        Optional Call         
Amount (000)    Description (1)    Provisions (2)    Ratings (3)    Value 
    Consumer Staples – 2.2% (1.5% of Total Investments)             
$          1,625    Golden State Tobacco Securitization Corporation, California, Tobacco Settlement Asset-Backed    6/13 at 100.00    BBB   $   1,999,904 
     Revenue Bonds, Series 2003A-2, 7.900%, 6/01/42             
    Health Care – 12.9% (8.7% of Total Investments)             
1,500    California Health Facilities Financing Authority, Revenue Bonds, UCSF – Stanford Healthcare,    11/08 at 101.00    AAA    1,546,710 
     Series 1998A, 5.000%, 11/15/31 – FSA Insured             
1,800    California Infrastructure Economic Development Bank, Revenue Bonds, Kaiser Hospital Assistance    8/11 at 102.00    A+    1,928,502 
     LLC, Series 2001A, 5.550%, 8/01/31             
2,000    California Statewide Community Development Authority, Hospital Revenue Bonds, Monterey    6/13 at 100.00    AAA    2,172,900 
     Peninsula Hospital, Series 2003B, 5.250%, 6/01/23 – FSA Insured             
4,060    California Statewide Community Development Authority, Revenue Bonds, Sherman Oaks Health    No Opt. Call    AAA    4,481,631 
     System, Series 1998A, 5.000%, 8/01/22 – AMBAC Insured             
1,260    Rancho Mirage Joint Powers Financing Authority, California, Revenue Bonds, Eisenhower Medical    7/14 at 100.00    A3    1,417,172 
     Center, Series 2004, 5.875%, 7/01/26             
10,620    Total Health Care            11,546,915 
    Housing/Multifamily – 1.4% (0.9% of Total Investments)             
1,165    Poway, California, Housing Revenue Bonds, Revenue Bonds, Poinsettia Mobile Home Park, Series    5/13 at 102.00    BBB+    1,200,055 
     2003, 5.000%, 5/01/23             
    Long-Term Care – 5.7% (3.8% of Total Investments)             
1,000    ABAG Finance Authority for Non-Profit Corporations, California, Insured Senior Living Revenue    11/12 at 100.00    A    1,057,230 
     Bonds, Odd Fellows Home of California, Series 2003A, 5.200%, 11/15/22             
2,000    California Health Facilities Financing Authority, Cal-Mortgage Insured Revenue Bonds, Northern    1/13 at 100.00    A+    2,121,040 
     California Retired Officers Community Corporation – Paradise Valley Estates, Series 2002,             
     5.250%, 1/01/26             
1,815    California Statewide Community Development Authority, Revenue Bonds, Jewish Home for the    11/13 at 100.00    A    1,917,039 
     Aging, Series 2003, 5.000%, 11/15/18             
4,815    Total Long-Term Care            5,095,309 
    Tax Obligation/General – 47.7% (31.8% of Total Investments)             
2,000    Butte-Glenn Community College District, Butte and Glenn Counties, California, General    8/12 at 101.00    Aaa    2,127,640 
     Obligation Bonds, Series 2002A, 5.000%, 8/01/26 – MBIA Insured             
    California, General Obligation Bonds, Series 2004:             
1,000     5.125%, 2/01/27    2/14 at 100.00    A+    1,072,370 
500     5.250%, 4/01/34    4/14 at 100.00    A+    541,120 
    California, General Obligation Refunding Bonds, Series 2002:             
3,750     5.000%, 4/01/27 – AMBAC Insured    4/12 at 100.00    AAA    3,956,025 
3,000     5.250%, 4/01/30 – XLCA Insured    4/12 at 100.00    AAA    3,209,640 
450    Fremont Unified School District, Alameda County, California, General Obligation Bonds, Series    8/12 at 101.00    AAA    480,636 
     2002A, 5.000%, 8/01/25 – FGIC Insured             
    Hacienda La Puente Unified School District, Los Angeles County, California, General Obligation             
    Bonds, Series 2003B:             
4,500     5.000%, 8/01/26 – FSA Insured    8/13 at 100.00    AAA    4,788,000 
2,030     5.000%, 8/01/27 – FSA Insured    8/13 at 100.00    AAA    2,159,920 
10,500    Los Angeles Unified School District, California, General Obligation Bonds, Series 2003A,    7/13 at 100.00    AAA    11,208,855 
     5.000%, 7/01/22 – FSA Insured             
1,540    Los Angeles Unified School District, California, General Obligation Bonds, Series 2006B,    7/16 at 100.00    AAA    1,628,026 
     4.750%, 7/01/25 – FGIC Insured (UB)             
2,000    Los Angeles, California, General Obligation Bonds, Series 2002A, 5.000%, 9/01/22 – MBIA Insured    9/12 at 100.00    AAA    2,123,920 
1,000    Murrieta Valley Unified School District, Riverside County, California, General Obligation    9/13 at 100.00    AAA    1,064,690 
     Bonds, Series 2003A, 5.000%, 9/01/26 – FGIC Insured             
140    Roseville Joint Union High School District, Placer County, California, General Obligation    8/15 at 100.00    AAA    150,641 
     Bonds, Series 2006B, 5.000%, 8/01/27 – FGIC Insured             
3,000    San Diego Unified School District, California, General Obligation Bonds, Election of 1998,    7/10 at 100.00    AAA    3,159,240 
     Series 2000B, 5.125%, 7/01/22 – MBIA Insured             
152    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/16 at 101.00    AAA    156,075 
     Series 2006F-1, 4.500%, 7/01/29 – FSA Insured (UB)             
635    San Diego Unified School District, San Diego County, California, General Obligation Bonds,    7/16 at 101.00    AAA    652,022 
     Series 2006G-1, 4.500%, 7/01/29 – FSA Insured (UB)             
3,855    San Rafael City High School District, Marin County, California, General Obligation Bonds,    8/12 at 100.00    AAA    4,078,667 
     Series 2003A, 5.000%, 8/01/28 – FSA Insured             
40,052    Total Tax Obligation/General            42,557,487 
    Tax Obligation/Limited – 41.6% (27.7% of Total Investments)             
550    Baldwin Park Public Financing Authority, California, Sales Tax and Tax Allocation Bonds,    8/13 at 102.00    BBB    585,129 
     Puente Merced Redevelopment Project, Series 2003, 5.250%, 8/01/21             
2,025    Burbank Public Financing Authority, California, Revenue Refunding Bonds, Golden State    12/13 at 100.00    AAA    2,197,064 
     Redevelopment Project, Series 2003A, 5.250%, 12/01/22 – AMBAC Insured             
2,000    California State Public Works Board, Lease Revenue Bonds, Department of Corrections, Series    12/13 at 100.00    A    2,227,740 
     2003C, 5.500%, 6/01/16             
4,000    California State Public Works Board, Lease Revenue Bonds, Department of General Services,    12/12 at 100.00    AAA    4,212,680 
     Capital East End Project, Series 2002A, 5.000%, 12/01/27 – AMBAC Insured             
170    Capistrano Unified School District, Orange County, California, Special Tax Bonds, Community    9/15 at 100.00    AAA    183,287 
     Facilities District, Series 2005, 5.000%, 9/01/24 – FGIC Insured             
525    Chino Redevelopment Agency, California, Merged Chino Redevelopment Project Area    9/16 at 101.00    AAA    568,097 
     Tax Allocation Bonds, Series 2006, 5.000%, 9/01/38 – AMBAC Insured (UB)             
1,610    Folsom Public Financing Authority, California, Special Tax Revenue Bonds, Series 2004A,    9/12 at 102.00    AAA    1,726,596 
     5.000%, 9/01/21 – AMBAC Insured             
130    Hesperia Community Redevelopment Agency, California, Tax Allocation Bonds, Series 2005A,    9/15 at 100.00    AAA    140,660 
     5.000%, 9/01/20 – XLCA Insured             
5,540    Irvine Public Facilities and Infrastructure Authority, California, Assessment Revenue Bonds,    9/13 at 100.00    AAA    5,721,380 
     Series 2003C, 5.000%, 9/02/21 – AMBAC Insured             
315    Los Angeles Community Redevelopment Agency, California, Lease Revenue Bonds, Manchester Social    9/15 at 100.00    Aaa    335,295 
     Services Project, Series 2005, 5.000%, 9/01/37 – AMBAC Insured             
1,770    Los Angeles Unified School District, California, Certificates of Participation, Administration    10/12 at 100.00    AAA    1,861,686 
     Building Project II, Series 2002C, 5.000%, 10/01/27 – AMBAC Insured             
2,000    Los Angeles, California, Certificates of Participation, Municipal Improvement Corporation,    6/13 at 100.00    AAA    2,112,940 
     Series 2003AW, 5.000%, 6/01/33 – AMBAC Insured             
1,500    Los Osos, California, Improvement Bonds, Community Services Wastewater Assessment District 1,    9/10 at 103.00    AAA    1,581,780 
     Series 2002, 5.000%, 9/02/33 – MBIA Insured             
150    Rialto Redevelopment Agency, California, Tax Allocation Bonds, Merged Project Area, Series    9/15 at 100.00    AAA    159,665 
     2005A, 5.000%, 9/01/35 – XLCA Insured             
190    Roseville, California, Certificates of Participation, Public Facilities, Series 2003A, 5.000%,    8/13 at 100.00    AAA    200,959 
     8/01/25 – AMBAC Insured             
    San Buenaventura, California, Certificates of Participation, Golf Course Financing Project,             
    Series 2002D:             
3,000     5.000%, 2/01/27 – AMBAC Insured    2/12 at 100.00    AAA    3,139,410 
3,300     5.000%, 2/01/32 – AMBAC Insured    2/12 at 100.00    AAA    3,453,186 
1,200    San Diego Redevelopment Agency, California, Subordinate Lien Tax Increment and Parking Revenue    9/09 at 101.00    Baa2    1,247,988 
     Bonds, Centre City Project, Series 2003B, 5.250%, 9/01/26             
2,770    San Jose Financing Authority, California, Lease Revenue Refunding Bonds, Civic Center Project,    6/12 at 100.00    AAA    2,905,758 
     Series 2002B, 5.000%, 6/01/32 – AMBAC Insured             
2,390    Solano County, California, Certificates of Participation, Series 2002, 5.250%, 11/01/24 – MBIA    11/12 at 100.00    AAA    2,577,328 
     Insured             
35,135    Total Tax Obligation/Limited            37,138,628 
    Transportation – 10.2% (6.8% of Total Investments)             
5,480    Bay Area Governments Association, California, BART SFO Extension, Airport Premium Fare Revenue    8/12 at 100.00    AAA    5,762,330 
     Bonds, Series 2002A, 5.000%, 8/01/26 – AMBAC Insured             
2,000    Foothill/Eastern Transportation Corridor Agency, California, Toll Road Revenue Bonds, Series    1/10 at 100.00    BBB–    2,010,640 
     1995A, 5.000%, 1/01/35             
1,300    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International    5/10 at 101.00    AAA    1,360,125 
     Airport, Second Series 2000, Issue 26B, 5.000%, 5/01/25 – FGIC Insured             
8,780    Total Transportation            9,133,095 
    U.S. Guaranteed – 9.8% (6.5% of Total Investments) (4)             
1,000    Berryessa Union School District, Santa Clara County, California, General Obligation Bonds,    8/12 at 100.00    AAA    1,080,490 
     Series 2003C, 5.000%, 8/01/21 (Pre-refunded 8/01/12) – FSA Insured             
1,000    California Health Facilities Financing Authority, Revenue Bonds, Cedars-Sinai Medical Center,    12/09 at 101.00    A3 (4)    1,089,590 
     Series 1999A, 6.250%, 12/01/34 (Pre-refunded 12/01/09)             
1,940    California Statewide Community Development Authority, Revenue Bonds, Sherman Oaks Health    8/08 at 102.00    AAA    2,026,718 
     System, Series 1998A, 5.000%, 8/01/22 (Pre-refunded 8/01/08) – AMBAC Insured             
3,135    San Francisco Airports Commission, California, Revenue Bonds, San Francisco International    5/08 at 101.00    AAA    3,234,850 
     Airport, Second Series Issue 16B, 5.000%, 5/01/24 (Pre-refunded 5/01/08) – FSA Insured             
1,220    San Jose Redevelopment Agency, California, Tax Allocation Bonds, Merged Area Redevelopment    8/10 at 101.00    AAA    1,269,788 
     Project, Series 2002, 5.000%, 8/01/32 (Pre-refunded 8/01/10) – MBIA Insured             
8,295    Total U.S. Guaranteed            8,701,436 
    Utilities – 5.6% (3.7% of Total Investments)             
1,000    Anaheim Public Finance Authority, California, Second Lien Electric Distribution Revenue Bonds,    10/14 at 100.00    AAA    1,098,490 
     Series 2004, 5.250%, 10/01/21 – MBIA Insured             
3,055    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/11 at 100.00    AAA    3,246,335 
     2001A-1, 5.250%, 7/01/22 – FSA Insured             
275    Los Angeles Department of Water and Power, California, Power System Revenue Bonds, Series    7/13 at 100.00    AAA    297,470 
     2003A-2, 5.000%, 7/01/21 – MBIA Insured             
310    Merced Irrigation District, California, Electric System Revenue Bonds, Series 2005, 5.125%,    9/15 at 100.00    AAA    334,217 
     9/01/31 – XLCA Insured             
4,640    Total Utilities            4,976,512 
    Water and Sewer – 11.9% (7.9% of Total Investments)             
215    Healdsburg Public Financing Authority, California, Wastewater Revenue Bonds, Series 2006,    4/16 at 100.00    AAA    231,342 
     5.000%, 4/01/36 – MBIA Insured             
1,055    Manteca Financing Authority, California, Sewerage Revenue Bonds, Series 2003B, 5.000%,    12/13 at 100.00    Aaa    1,056,846 
     12/01/33 – MBIA Insured             
170    Marina Coast Water District, California, Enterprise Certificate of Participation, Series 2006,    6/16 at 100.00    AAA    182,981 
     5.000%, 6/01/31 – MBIA Insured             
370    Sacramento County Sanitation District Financing Authority, California, Revenue Bonds, Series    6/16 at 100.00    AAA    400,684 
     2006, 5.000%, 12/01/36 – FGIC Insured             
    San Diego Public Facilities Financing Authority, California, Subordinate Lien Water Revenue             
    Bonds, Series 2002:             
3,000     5.000%, 8/01/22 – MBIA Insured    8/12 at 100.00    AAA    3,183,480 
2,500     5.000%, 8/01/23 – MBIA Insured    8/12 at 100.00    AAA    2,652,900 
1,180    South Feather Water and Power Agency, California, Water Revenue Certificates of Participation,    4/13 at 100.00    BBB    1,248,629 
     Solar Photovoltaic Project, Series 2003, 5.375%, 4/01/24             
1,600    Sunnyvale Financing Authority, California, Water and Wastewater Revenue Bonds, Series 2001,    10/11 at 100.00    AAA    1,671,424 
     5.000%, 10/01/26 – AMBAC Insured             
10,090    Total Water and Sewer            10,628,286 
$      125,217    Total Long-Term Investments (cost $125,847,977) – 149.0%            132,977,627 
    Short-Term Investments – 1.1% (0.7% of Total Investments)             
1,000    Puerto Rico Government Development Bank, Adjustable Refunding Bonds, Variable Rate Demand        A-1+    1,000,000 
     Obligations, Series 1985, 3.290%, 12/01/15 – MBIA Insured (5)             
$          1,000    Total Short-Term Investments (cost $1,000,000)            1,000,000 
    Total Investments (cost $126,847,977) – 150.1%            133,977,627 
    Floating Rate Obligations – (2.1%)            (1,902,000) 
    Other Assets Less Liabilities – 2.4%            2,159,134 
    Preferred Shares, at Liquidation Value – (50.4)%            (45,000,000) 
    Net Assets Applicable to Common Shares – 100%           $   89,234,761 

    At least 80% of the Fund’s net assets (including net assets attributable to Preferred shares) are invested 
    in municipal securities that are either covered by Original Issue Insurance, Secondary Market Insurance or 
    Portfolio Insurance which ensures the timely payment of principal and interest. Up to 20% of the Fund’s 
    net assets (including net assets attributable to Preferred shares) may be invested in municipal securities 
    that are (i) either backed by an escrow or trust containing sufficient U.S. Government or U.S. Government 
    agency securities (also ensuring the timely payment of principal and interest), or (ii) rated, at the time of 
    investment, within the four highest grades (Baa or BBB or better by Moody’s, S&P or Fitch) or unrated but 
    judged to be of comparable quality by the Adviser. 
(1)    All percentages shown in the Portfolio of Investments are based on net assets applicable to Common 
    shares unless otherwise noted. 
(2)    Optional Call Provisions: Dates (month and year) and prices of the earliest optional call or redemption. 
    There may be other call provisions at varying prices at later dates. Certain mortgage-backed securities 
    may be subject to periodic principal paydowns. 
(3)    Ratings: Using the higher of Standard & Poor’s or Moody’s rating. Ratings below BBB by Standard & Poor’s 
    Group or Baa by Moody’s Investor Service, Inc. are considered to be below investment grade. 
(4)    Backed by an escrow or trust containing sufficient U.S. Government or U.S. Government agency securities 
    which ensure the timely payment of principal and interest. Such investments are normally considered to 
    be equivalent to AAA rated securities. 
(5)    Investment has a maturity of more than one year, but has variable rate and demand features which qualify 
    it as a short-term investment. The rate disclosed is that in effect at the end of the reporting period. This 
    rate changes periodically based on market conditions or a specified market index. 
N/R    Not rated. 
(UB)    Underlying bond of an inverse floating rate trust reflected as a financing transaction pursuant to the 
    provisions of SFAS No. 140. 

Income Tax Information

The following information is presented on an income tax basis. Differences between amounts for financial statement and federal income tax purposes are primarily due to the treatment of paydown gains and losses, timing differences in recognizing taxable market discount, timing differences in recognizing certain gains and losses on investment transactions and the treatment of inverse floating rate transactions subject to SFAS No. 140.

At November 30, 2006, the cost of investments was $125,424,079.

Gross unrealized appreciation and gross unrealized depreciation of investments at November 30, 2006, were as follows:

Gross unrealized:     
  Appreciation    $7,141,993 
  Depreciation    (489,813) 
Net unrealized appreciation (depreciation) of investments    $6,952,180 

Item 2. Controls and Procedures.

  1. The registrant's principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act") (17 CFR 270.30a-3(c))) are effective, as of a date within 90 days of the filing date of this report that includes the disclosure required by this paragraph, based on their evaluation of the controls and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR 270.30a-3(b)) and Rule 13a-15(b) or 15d-15(b) under the Securities Exchange Act of 1934 (17 CFR 240.13a-15(b) or 240.15d-15(b)).
  2. There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting.

Item 3. Exhibits.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the 1940 Act (17 CFR 270.30a-2(a)), exactly as set forth below: EX-99 CERT Attached hereto.


SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant)         Nuveen Insured California Tax-Free Advantage Municipal Fund        

By (Signature and Title)*          /s/ Jessica R. Droeger                     
                                                    Jessica R. Droeger
                                                    Vice President and Secretary

Date         January 29, 2007        

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By (Signature and Title)*         /s/ Gifford R. Zimmerman                    
                                                   Gifford R. Zimmerman
                                                   Chief Administrative Officer (principal executive officer) 

Date         January 29, 2007        

By (Signature and Title)*         /s/ Stephen D. Foy                              
                                                   Stephen D. Foy
                                                   Vice President and Controller (principal financial officer) 

Date        January 29, 2007        

* Print the name and title of each signing officer under his or her signature.