Marine antennas are of different types and each one is necessary for each receiving and/or transmitting device on the boat.
Normally, the larger the vessel, the higher the number of antennas present, as the higher the number of receiving and/or transmitting devices that must be present on the vessel.
The shapes that an antenna can take are also manifold. The range goes from the VHF stylus antennas to the small domes for the TV antenna, and then go on to the larger radar antennas and then continue with the various satellite antennas including the majestic INMARSAT antennas.
All marine antennas are usually marinated and watertight. Marinizing is carried out by insulating any electronic boards and protecting the active elements. The water protection is provided by special enclosures or protections of variable shape and size depending on the antenna.