Wall mounting hardware used to install the antenna on the eave. Projection Length: 4.1 inches (103 mm). In combination with a mast sold separately, the UHF antenna can be installed with 2 UHF antennas and less than 50 shape BS antennas or 1 UHF antenna and 1 50 shape BS antenna. Compatible mast diameter: 0.9 - 1.3 inches (22 - 32 mm). Hot-dipped galvanized (HDZ35) for superior corrosion resistance. The bolt stopper is made of stainless steel (SUS304). The wind resistant speed is 164.4 ft/s (50 m/s) depending on the mast and mounting position.