No need to call for a radio check when you have this compact, easy to use, unit on-board. Unlike other meters in its class, the ART-3 tests receiver function as well as output power and VSWR (antenna efficiency). It is powered by an internal battery or can be connected to ships 12 VDC with the supplied power cable. Battery level can be checked at the flip of a switch. No serious boater should be without an ART-3. When paired with an optional 2-way band separator between the antenna and the amplifier, these antennas can also receive AM/FM radio signals. The 3004 antenna is designed for the mobile lifestyle and can be used on marine vessels, RVs, pop-up campers and more! Watch your favorite sports, sitcoms, reality TV, crime dramas, local news, weather, kids programming and more for FREE and in 1080 HD!