ROHN FRM225 Non-Penetrating Roof Mount 2.25 x 60 inch Mast Made in the USA! This roof mount is able to support various Antenna EPA's depending on wind and Ballast load (see details). The base of the roof mount is 3’ square with a 16” tray to fit concrete blocks, typically used as ballast for placement of various TV, Radio, Microwave, WiFi and Wireless Internet Antennas. The base mount is 16 gauge Pre-Galvanized and the mast tube is thick-walled galvanized steel for corrosion protection and goes together quickly. Antenna and wind loads vs ballast weight are found in the spec sheet below.