An integrated enclosure and antenna support tower for telecommunications equipment, such as cellular telephone, radio transmitter/receivers. The enclosure includes a generally rectangular tubular steel frame including vertical column members, roof purlins and roof rafters welded together to form a frame for supporting exterior wall paneling and roof decking. A cylindrical cross-section metal plate tower section is supported on the enclosure frame by a plurality of webs interconnecting the tower section with the frame to transfer the weight of the tower to the frame column members. Conventional antennas or antenna truss type towers may be mounted on the tower section connected to the enclosure. The tower section may serve as a duct for enclosure ventilation air for intake or exhaust of such air at an elevation substantially above ground level. An air intake or exhaust plenum may also be mounted directly adjacent to or formed as part of the enclosure. The integrated enclosure may include a support base, a climate control enclosure building and an antenna tower support member disposed on the support base directly adjacent the enclosure building.