TELEWAVE's ANTC483 mounting clamp kit for fiberglass collinear antennas such as ANTXXXF6,10,0 Use as replacement for mounts included with these antennas. ANTC483 can be attached to square or round tower legs from 1.5 in – 3.5 in O.D. Clamp holes are 9/16 in diameter, and 4.75 in center to center.