A single tower mast is a single section aluminum antenna tower. The B-130RHA, Single “B” Section Aluminum Tower, is complete with a 2 in diameter (5.0800 cm) x 1/8 in (0.31750 cm) wall x 8 ft (2.4384 m) long mast, installed rotor mounting plate, “H” type hinged base, and building bracket. An optional mast rotor and thrust bearing is available