The Sennheiser GA 3 rack mount adapter mounts two ew G3 EM receivers or two Sennheiser SR transmitters side by side in one rack space. Use the GA 3 to rack a single Sennheiser EM/SR. When using the single option, use the two holes for the AM2 antenna front mount relocation kit, located in the included front panel. Mount the antennas up front where reception is vastly improved over being stuck in the back of your rack.