VHF/AIS Antenna Connection
Radio-frequency fields generated by a VHF/AIS antenna may interfere with medical devices. Consult your physician and medical device manufacturer with questions.
This device generates and radiates radio frequency (RF) electromagnetic energy (EME). Failure to observe these guidelines may expose people to RF radiation absorption exceeding the maximum permissible exposure (MPE).
To transmit and receive signals, you must connect a VHF external antenna (not included) to the ANTENNA port on the Garmin Signal™ VHF 400/220 radio.
In most cases, you should use a VHF antenna that is well-tuned at the AIS end of the band (VSWR 2:1 or less at 162 MHz).
Garmin® declares a Maximum Permissible Exposure (MPE) radius of 2 m (6.6 ft.) for this system, which was determined using 25 W output to an omni-directional, 6 dBi gain antenna. The antenna should be installed to maintain a distance of 2 m (6.6 ft.) between the antenna and all people. Due to the typical shape of a VHF antenna radiation pattern, if the antenna is mounted 2.5 m (8.2 ft.) above the deck, this distance may be reduced to 0.5 m (1.7 ft.).
For help choosing a VHF antenna, you can go to garmin.com/VHFAntenna.