The mAT-40 HF-SSB Automatic Antenna Tuner is a versatile device that allows rapid automatic tuning of unbalanced or single-wire antennas. It is compatible with various transmitter brands like ICOM, YAESU, and KENWOOD through different interface cables. The tuner is known for its durable aluminium housing, making it suitable for use in harsh outdoor environments. Despite its capabilities, the tuner is compact, with a maximum size of only 20 cm, making it the smallest outdoor antenna tuner available.

One of the standout features of the mAT-40 is its advanced memory tuning functionality, offering 16000 memory locations for quick tuning near previously used frequencies. The tuner learns and recalls settings for favourite frequencies and bands, providing convenience and efficiency during operation. Additionally, users can initiate a tuning cycle manually whenever needed.

While the tuner's standard configuration does not include a 50-ohm coaxial cable, it comes with essential components such as the mAT-40 host, data cable (mAT-40-D, 10m), and specific interface cables for different transmitter brands. Users can choose additional interface cables, like the mAT-40-G universal cables, to support other radio brands. The tuner also has an extended stainless steel bracket for convenient installation, enhancing its durability and corrosion resistance.