Exhibit 1.1 VAN KAMPEN UNIT TRUSTS, SERIES 1104 TRUST AGREEMENT Dated: April 28, 2011 This Trust Agreement among Van Kampen Funds Inc., as Depositor, The Bank of New York Mellon, as Trustee, and Van Kampen Asset Management, as Supervisor, sets forth...Trust Agreement • April 28th, 2011 • Van Kampen Unit Trusts Series 1104
