Description
Exploring the Yaesu ATAS-120A: An All-in-One Solution for Mobile Ham Radio Enthusiasts
The Yaesu ATAS-120A (Auto-Tune Motorized Antenna) is an unusual product in the antenna market. It is designed for compatibility with a range of Yaesu models, including the FT-857D, FT-450D, and FT-897D, among others. On specification it delivers a level of convenience that no manual antenna can match, with a few considerations worth weighing first.
Design and Build Quality
The two-piece design of the Yaesu ATAS-120A is both compact and functional. It features a motorized lower coil section topped with a durable stainless steel whip, extending to approximately 5 feet when fully deployed. The build is substantial, with materials chosen for outdoor and vehicle service life. The motorized “trombone” section is the defining feature, adjusting the antenna’s electrical length automatically to bring SWR into range. For operators who change bands often, that removes the single most tedious part of mobile HF.
While the design is aimed at mobile (automotive) use, the antenna requires an optional SO-239 thread mobile mount and coaxial cable, which are not included. That adds a purchasing step, though installation is simple once the accessories are on hand. Buyers without a suitable mounting point should look at options such as the Stryker SR-A10 mirror mount antenna.
Performance Across Bands
The ATAS-120A antenna covers HF through UHF bands, specifically from 40 meters to 70cm. That is an exceptionally wide span for a single mobile antenna, and it is the reason the model has held its place in the range for so long. The automatic tuning works with compatible Yaesu radios at the push of a button, with the transceiver driving the motor directly rather than through a separate controller. On radios such as the FT-991A the tune completes in a couple of seconds.
Tuning is slower on the lower bands, particularly around 40 meters, because the coil has further to travel to reach resonance. That is a physical constraint of the design rather than a fault, but it is worth knowing if you operate mostly on lower frequencies. Signal performance across the range is solid for a compact mobile whip.
Ease of Use
One of the key benefits of this antenna is how little attention it needs. Once installed, the automatic tuning mechanism removes manual adjustment entirely, which is impractical to do safely in a moving vehicle. The plug-and-play compatibility with Yaesu radios makes it a natural fit for anyone already committed to the brand.
The requirement for a separate mount and coaxial cable is a genuine hurdle for beginners, since it is not usable out of the box. Newcomers wanting a simpler single-purchase option should compare the Comet CA-2X4SRNMO for VHF and UHF work.
Key Benefits
- Broad Frequency Coverage: Supports HF to UHF bands, making it versatile for various applications.
- Automatic Tuning: The motorized adjustment system simplifies operations and holds SWR in range.
- Durable Build: Stainless steel whip and robust construction promise long-lasting use.
- Compatibility: Designed specifically for Yaesu models, ensuring seamless integration.
Areas for Improvement
- Additional Accessories Required: The need for a separate mount and coaxial cable adds extra steps and costs.
- Slower Tuning on Lower Frequencies: Tuning takes longer on bands like 40 meters.
- Limited Compatibility: Only works with select Yaesu radios, so it’s not a universal solution.
Competing Products
There are other antennas worth considering. The Diamond SD330 offers manual tuning but supports a broader range of radios; it is more affordable but lacks motorized adjustment, and the fixed Diamond X30A covers only VHF and UHF from a base location. The MFJ-1668 performs well across HF bands with a focus on stationary use, though it is bulkier and less suited to mobile operations. Budget dual-band options such as the Tram 1481 cost a fraction as much but do not touch HF at all.
Against these competitors, the ATAS-120A stands out for its ease of use and seamless integration with Yaesu radios. Its reliance on additional accessories and slower low-band tuning will still push some buyers toward alternatives.
Cost Efficiency
On price-to-quality ratio, the ATAS-120A offers good value to anyone already running compatible Yaesu radios, and it is the most automated of the radio antennas we track. Its automatic tuning and rugged build justify the outlay, particularly for mobile operators who need a hands-off solution. The extra cost of accessories will deter some buyers, but the overall convenience and coverage make a strong case.
In summary, the Yaesu ATAS-120A is a solid choice for ham radio operators who prioritise ease of use and compatibility with Yaesu equipment. There are a few areas for improvement, but the benefits clearly outweigh the drawbacks for a mobile setup.
