ROHN's R-25GBRM is a non-penetrating roof mount designed to support Rohn model 25G tower sections. The mount is able to support two (2) sections of 25G tower in a self-supporting application. The base of the mount covers 10 sq-ft and is equipped with a 16 in tray designed for the concrete blocks typically used as ballast. Use of a rubberized support mat is recommended underneath the roof mount.