EXHIBIT 4.1


                         Fixed Income Securities, L.P.
                              18925 Base Camp Road
                           Monument, Colorado  80132



                                 August 5, 2004



Advisor's Disciplined Trust, Series 11
c/o The Bank of New York, as Trustee
BNY Atlantic Terminal
2 Hanson Place, 12th Floor
Brooklyn, New York 11217


     Re:             Advisor's Disciplined Trust, Series 11
                    GNMA Advantage Income Portfolio, Series 2
                    -----------------------------------------

Ladies and Gentlemen:

     We have examined the Registration Statement File No. 333-116015 for the
above captioned fund.  We hereby consent to the use in the Registration
Statement of the references to Fixed Income Securities, L.P. as evaluator.

          You are hereby authorized to file a copy of this letter with the
Securities and Exchange Commission.

                                Sincerely,

                                FIXED INCOME SECURITIES, L.P.


                                By     /s/ ALEX R. MEITZNER
                                  ------------------------------
                                        Managing Director