The Yaesu ATAS-120A is a multi-band mobile antenna featuring the “Active Tuning Antenna System”, designed for amateur radio operators needing broad band coverage (HF through VHF/UHF) and convenient operation in vehicle or portable installations. With an internal motor mechanism, the antenna adjusts its radiator length automatically to achieve low SWR and optimum performance — no external tuner required.
Yaesu’s ATAS line is known for high build quality, reliable performance and a design intended for mobile or field use. The ATAS-120A offers great flexibility by covering many bands with only one antenna, reducing the need for multiple whips or separate elements.
Technical Specifications
-
Operating frequency range: 7 / 14 / 21 / 28 / 50 / 144 / 430 MHz (HF + 6 m + 2 m + 70 cm)
-
Input impedance: 50 Ω
-
Maximum input power: 120 W (SSB/CW, 50% duty cycle)
-
Matched SWR: < 2.0 : 1 with proper counterpoise
-
Antenna length (approx.): 1.4 to 1.6 m, depending on band
-
Weight: approx. 900 g
-
Mounting connector: Type “M” (PL-259) standard mobile antenna base
-
Operation mode: Motor-driven automatic tuning controlled directly from compatible Yaesu radio — no external tuner necessary
-
Application: Ideal for mobile vehicle installations, portable operations or even fixed mounting on a balcony/roof with the correct base and counterpoise
-
Construction: Rugged, weather-resistant design suitable for outdoor use
The Yaesu ATAS-120A provides a complete multi-band solution with automatic tuning capability for vehicle or portable operation, emphasizing simplicity and performance.
