2016-19. Antenna nut. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Antenna Amplifier. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Radio Antenna. Radio Antenna Base Nut. Amplifier. GPS. Radio Base. Radio Mast. Satellite. Included with: Satellite antenna.