This is a printed threaded camp for supporting small BNC antennas like the Elecraft AX1 or AX2. A 2mm banana connector in installed and connected to the BNC shield to be used as a counterpoise (banana male plug included as well). Antenna bracket can be installed on either the side or end of the camp and in any rotated angle in 15deg increments. Opening is at max 2" and about 1" from clamp foot centerline to inside edge of clamp. Coax, Antenna, and counterpoise wire not included. Antenna in the photo is an Elecraft AX2. Their AX1 and coil also work on this clamp mount.