Antenna mounting and EME exposure

MPEInstallationVHF antenna requirementsRaymarine® declares a Maximum Permissible Exposure (MPE) radius of 1.8 meters (5.9 ft.) for this system, assuming 25 watts output to an omnidirectional antenna of 3dBi gain or less.

For watercraft with suitable structures, the antenna base must be at least 3.8 meters (12.5 ft) above the main deck to meet the MPE for persons up to 2 metres (6.6 ft) tall. For watercraft without such structures, the antenna must be mounted so that its base is a minimum of 1.8 meters (5.9 ft.) vertically from heads of all persons.

The antenna must be isolated from the vessel’s metalwork using an insulated (e.g. plastic) mounting bracket.