Icom Automatic Antenna Tuner f/M802-01 HF. For example the AT-130 will match a 7 m (23 feet) long wire antenna across the marine band in the 1.6 - 27.5 MHz range. Automatic tuning No manual tuning is needed. Just push the TUNE switch on an Icom HF marine transceiver; the AT-130 adjusts the antenna and the transceiver to the minimum SWR in any frequency on an HF marine band. The AT-130 allows you to transmit with strong RF output power and is perfect for maritime mobile operations. Weather resistant The AT-130 is housed in a durable completely weather-resistant acrylic case with rubber gaskets. This allows it to be conveniently installed near the antenna element base. For Icom HF marine transceivers Icom's sophisticated AT-130 easily matches Icom HF marine transceivers. The AT-130 easily interconnects with an Icom HF marine transceiver. AT-130 installation is simple. No adjustments are necessary. Just connect the control cable and antenna wire and go Quick tune-up Improved tuning performance...the tune-up time is less than 3 seconds in any frequency on an HF marine band. In addition the AT-130 has 8 convenient memories to store tuning information. Retuning for a memorized frequency takes about 1.5 seconds. This allows you quick trouble-free frequency changes. Low power tune-up The AT-130 emits very little output power (just 300 mW) during the tuning process. This reduces the possibility of causing interference to other stations using the frequency. Specifications for Icom HF Automatic Antenna Tuner f/M802-01: Manufacturer: Icom Color: Black Package Contents: Icom HF Automatic Antenna Tuner f/M802-01 Icom AT130: Automatic Antenna Tuner f/M802-01 HF