LINEAR Garage Door EXA-1000 Extended Range Antenna The EXA-1000 remote antenna is designed to enhance the radio range of Linear receivers. This antenna can be connected to the "F" connector on many Linear receivers to improve their range. A 2 inch u-bolt is supplied for post or pipe mounting. Or, the u-bolt holes in the base plate can be used to screw the antenna to a wall or vertical wood brace or beam. Includes remote antenna, u-bolt, and 5 feet of 75 OHM coaxial cable.