The ZM24-VHF marine VHF communications deck mount antenna comes standard at 2.4m tall with 4.5 metres of cable and a UHF male supplied. With 5.1dBi gain and a power rating of 50 Watts the ZM24-VHF is the ideal marine VHF communications antenna. The ZM24-VHF requries a MM1 white nylon fold-down base or MM2 stainless steel fold-down base. See out Maritime VHF CB Radio channel guide for channel usage. FREQUENCY Marine VHF 156-162MHz. Height: 2.4m, Diameter: 28.6mm