The Yaesu ATAS-120A Active Tuning Antenna System provides HF/VHF/UHF coverage with automatic motorized tuning. It is the successor to the popular ATAS-100. Utilizing control signals from the transceivers microprocessor received via the coaxial cable, the ATAS-120's internal motor adjusts the radiator length for best SWR. The ATAS-120 covers the 7, 14, 21, 28, 50, 144 and 430 MHz amateur bands and is compatible with the FT-100, FT-847, FT-897, and FT-897D.
M type mount is used. This antenna is approximately 5.25 feet high. A duplex or triplexer, depending on radio, is required (not supplied).