Mount your radar high on the mast of your sailboat and away from your boat's crew. Radars can also see other objects at greater distances when mounted higher versus lower. Made of lightweight but strong aluminum and compatible with Garmin 18HD(+), Garmin 18xHD, Humminbird HB2124 CHIRP Radar, Lowrance 3G and 4G Radars, Raymarine Quantum 18" Radar Domes and Simrad 3G and 4G Radar Domes.