The Yaesu ATAS-25 antenna features a manual tuning system that adjusts the radiating element to achieve the lowest SWR without the need for costly mono-band resonating whip assemblies. This antenna allows for dual-frequency operation on HF or 50MHz, as well as 2m or 70cm bands. It is important to note that a duplexer is not included with the antenna. One of the standout features of the ATAS-25 is its compatibility with a standard camera tripod mount, making it a convenient choice for temporary field operations. However, it is not recommended for long-term outdoor installations. The antenna comes equipped with radiating elements, radial elements for VHF/UHF, radial wires, spare radial wire, and an Allen key for easy assembly.

In terms of specifications, the Yaesu ATAS-25 covers a wide frequency range including 7/14/21/28/50/144/430MHz with an input impedance of 50 Ohms. The maximum power input varies depending on the frequency band: for HF/50MHz, it can handle 100W (SSB/CW) or 50W (AM/FM), while for 144/430MHz, the maximum power input is 50W for all modes. The antenna is designed to maintain a matched VSWR of less than 2:1, ensuring efficient performance. With a maximum height of 2.2m (7.2ft) and a transportable height of 0.6m (1.96ft), the ATAS-25 is lightweight at 930g, making it easy to carry and set up for portable operations.