Wireless Active Antenna. Provides 10 db of gain. Omni-directional. Various mounting configurations (wall, mic stand, etc.). Two required for Diversity Tuner Operation. This AN-820A/9LL is for use with with UHF-TV channels 14 through 25. Highlights: Active omni-directional antenna For use with UHF-TV channels 14-25, 470-542 MHz Receives 9V DC power from receiver Adds 10 dB of gain. Compensates for cable loss/working distance Wall or stand mountable. Comes with adapter kits for electrical box mounting LED power indicator