The AD-90A is a UHF transmitting antenna amplifier for use with the AT-90 and MI-808T transmitters. To complete a high efficient, long distance transmission combination AD-90A can be connected to AT-90T UHF Wide band Unidirectional Antenna.MT-90 Wireless Linking Transmitter and AD-90S UHF Wide-band Power Splitter as an end-amplifier to boost signal before transmitting for applications that greatly needing extended RF transmission distance, maintains a clear and reliable signals and reduces chance for signal dropouts of extremely difficult RF environments.