VHF sailboat antenna with stainless steel angle bracket and SO239 connector.

156-163MHz VHF Marine Antenna 6.5dBi Stainless Steel Marine Antenna

This antenna by Navilock allows the usage of the 1575 MHz GPS band indoors and outdoors.  The material is particularly weather resistant.    

Constructed of UV resistant injection molded nylon. Installs with four 1/4” fasteners (not included). This Adjustable Antenna Base features dual swiveling mounts for full adjustability and a ratchet-style handle for side or deck mounting.

SD-MRF130V 3dBi omnidirectional antenna with N-female connector is an economical and high-performance antenna designed for high-power applications This omnidirectional antenna uses vertical polarization to transmit signals, thereby reducing interference and performing better at lower altitudes

6.5dBi Fiberglass antenna, SO239 connector， 5/8" 24TPI male thread, mast bracket N163F, made by AC Antennas The dimensions have been kept as small as possible to reduce weight, wind load and cost. Despite the small dimensions the efficiency is very high, and the antenna is fully capable of handling the full 50 W of output power from typical marine VHF transmitters