EXHIBIT 99.79
                                                                -------------

                             MATERIAL CHANGE REPORT

1.       NAME AND ADDRESS OF REPORTING ISSUER:

         Advantage Energy Income Fund
         3100, 150 - 6th Avenue S.W.
         Calgary, Alberta
         T2P 3H7

2.       DATE OF MATERIAL CHANGE:

         November 3, 2004

3.       NEWS RELEASE:

         A press release announcing the material change was issued on November
         3, 2004 for Canadian wide distribution through Canada Newswire.

4.       SUMMARY OF MATERIAL CHANGE:

         Advantage Energy Income Fund ("Advantage" or the "Fund") announced on
         November 3, 2004 that it has entered into an Arrangement Agreement (the
         "Arrangement") to acquire all of the outstanding shares of Defiant
         Energy Corporation ("Defiant"). As part of the Arrangement Defiant
         shareholders will also receive shares in a new exploration company
         ("Exploreco") which will be guided by the current Defiant management
         team. The transaction is expected to close in mid December, 2004.

         Advantage also announced that subject to the successful closing of the
         Arrangement on or before December 31, 2004, Advantage will increase the
         cash distribution by 12% to $0.28 per Unit for the month of January
         2005. The distribution will be payable on February 15, 2005 to
         Unitholders of record at the close of business on January 31, 2005. The
         ex-distribution date will be January 27, 2005.

5.       FULL DESCRIPTION OF MATERIAL CHANGE:

         THE ACQUISITION
         ---------------

         Advantage announced on November 3, 2004 that it has entered into the
         Arrangement to acquire all of the outstanding shares of Defiant. As
         part of the Arrangement Defiant shareholders will also receive shares
         in a new Exploreco which will be guided by the current Defiant
         management team. The transaction is expected to close in mid December,
         2004.

         Consideration for the acquisition is as follows:

         o        Advantage will acquire all of the approximately 34.0 million
                  fully diluted common shares of Defiant on the basis of one
                  Defiant Share for 0.201373 of an Advantage Unit or $4.40 per
                  share in cash, subject to a maximum cash consideration of $34
                  million. In lieu of Units, shareholders of Defiant may elect
                  to receive exchangeable shares issued by Advantage Oil & Gas
                  Ltd. subject to an aggregate limit of 1.5 million exchangeable
                  shares. Advantage will assume Defiant's debt which was
                  approximately $41.3 million at October 31, 2004.

         o        For each share of Defiant, Defiant shareholders will also
                  receive shares of the newly incorporated Exploreco, which will
                  hold approximately 97,000 net acres of undeveloped land and
                  the option to acquire approximately 120 boe/d of production
                  from Advantage in the West Pembina area for $5.6 million.

         Current operational information in respect of Defiant includes the
         following:

         o        Production of 3,450 boe/d is weighted 72% towards natural gas
                  and 28% to light oil and NGLs.

         o        Properties generate exceptional netbacks and have a Reserve
                  Life Index in excess of 12 years.

         o        Approximately 15.2 million boe of proven and probable reserves
                  are being acquired based on independent engineering
                  evaluations prepared by Sproule Associates Limited effective
                  July 1, 2004 and August 1, 2004.

         o        Asset base is highly concentrated consisting of three core
                  areas located in central Alberta in close proximity to
                  existing Advantage operations.

         o        Approximately  90% of the  production  is  operated,  with
                  four  projects  representing  85% of  current production.

         Advantage's 2004 $100 million drilling and development program will be
         unaffected. However the Defiant properties will provide Advantage with
         additional low risk development opportunities for 2005.

         The boards of directors of Advantage and Defiant have unanimously
         approved the transaction. Waterous & Co. ("Waterous") advised Defiant
         and its board of directors.

         Waterous, financial advisor to Defiant, has provided Defiant's board of
         directors with its opinion that the consideration to be received by
         shareholders of Defiant is fair from a financial point of view. The
         Defiant board has concluded that the transaction is in the best
         interests of the shareholders and have resolved to recommend
         shareholders to vote in favour of the Arrangement. Defiant has also
         agreed to terminate any discussions with other parties, will not
         solicit any other transaction and will provide Advantage 48 hours right
         of first refusal notice. If the transaction between Defiant and
         Advantage is not completed under certain conditions, Advantage will
         receive a break fee of $5.5 million.

         DISTRIBUTION INCREASE
         ---------------------

         Advantage also announced that subject to the successful closing of the
         Arrangement on or before December 31, 2004, Advantage will increase the
         cash distribution by 12% to $0.28 per Unit for the month of January
         2005. The distribution will be payable on February 15, 2005 to
         Unitholders of record at the close of business on January 31, 2005. The
         ex-distribution date will be January 27, 2005. The increased
         distribution represents an annualized yield of 16.4% based on the
         November 2, 2004 closing price of $20.54 per Unit.

6.       RELIANCE ON SUBSECTION 7.1(2) OR (3) OF NATIONAL INSTRUMENT 51-102.

         Not applicable.

7.       OMITTED INFORMATION:

         No information has been omitted.

8.       EXECUTIVE OFFICER:

         The name and business numbers of the executive officer of Advantage Oil
         & Gas Ltd., who is knowledgeable of the material change and this report
         is:

         Peter Hanrahan, Vice-President, Finance and Chief Financial Officer
         Telephone: (403) 781-8137
         Facsimile:  (403) 262-0723

Dated this 4th day of November, 2004 at the city of Calgary, in the province of
Alberta.



                             ADVANTAGE ENERGY INCOME FUND,
                             by Advantage Oil & Gas Ltd.



                             Per:  "PETER HANRAHAN"
                             ---------------------------------
                             Peter Hanrahan
                             Vice President, Finance and Chief Financial Officer
                             Advantage Oil & Gas Ltd.


cc:      Toronto Stock Exchange