ROHN's BRM425 non-penetrating roof mount, 2 in standard pipe (2 3/8 OD) x 34 1/4 in mast. This roof mount is able to support various antenna EPA's depending on wind and ballast load. The base of the roof mount is 6 ft – 6 sq-in. with a 16 in tray to fit concrete blocks, typically used as ballast. The base mount and mast pipe are hot-dip galvanized for corrosion protection and go together quickly.