It operates on 28-80 MHz. Has a built-in Antenna Tuning Drive for the MX-6707 antenna matching unit for the AS-1729 antenna. The Amplifier can put out a selective 30W or 6W RF. It is powered from a 22-33 V dc source. What you see is what you get, no additional accessories comes with the unit.The item "RANGE BOOSTER AMPLIFIER AM-4477 RB-25 FOR PRC-77 / PRC-25 Military Radio US ARMY" is in sale since Sunday, November 29, 2020. This item is in the category "Collectibles\Militaria\Surplus\Radios". The seller is "rm15483" and is located in Tel-Aviv. This item can be shipped worldwide.