Install GPS & VHF antennas above the radar for maximum visibility and performanceAll mounting holes predrilled for easy retrofit installation, attach using mounting bolts, no extra fastenings requiredCables run internally via a watertight sealMount starboard side of the radar antennaMarine-grade 316 stainless steelDesigned for the installation of GPS antenna andWhiptype VHF, HF/SSB, AM/FM, and cellular antenna of up to 1m in height - must have standard 1x 14TPI thread as their fixing. They are also designed to work with Pacific Aerials P6161 / P6162 adapter for their Pro range of antennas.