The Channel Master CM 9025 is a heavy duty 3 inch wall mount designed to handle large diameter masts and withstand wind forces. The Channel Master 9025 wall mount offers heavy duty steel construction and has 3 inches of standoff from the wall to allow the antenna mast to clear roof overhang. The CM 9025 includes lag bolts and can support a mast up to 2.5 inches in diameter. Channel Master recommends using guy wire for all antenna installations using masts over 10 feet.