The RA55A features a wide bandwidth from 40 MHz to 900 MHz. It is an amplifier best suited to amplifying VHF and UHF analog TV signals or digital TV signals. A VHF or UHF wave can be input, to obtain a maximum gain of 28 dB. In the RA55A, the input impedance is 75 ohm, and the output impedance is 50 ohm. The RA55A can compose a compact and high-power centralized signal generator system by combining the TG39A/TG19C SDTV signal generators or the DS13A/DS303B digital TV signal generators.