The Audio-Technica ATW-49CB Active Antenna Combiner Kit includes two Active Antenna Combiners designed for use with Audio-Technica 5000, 4000, 3000 and 2000 Series UHF wireless receivers and ATW-A49 LPDA antennas. Each Active Antenna Combiner is a broadband device (frequency range from 440 to 900 MHz) that combines two incoming RF signals into one outgoing RF signal. One set of Active Antenna Combiners enables two sets of antennas to feed one wireless receiver or distribution system.    NOTE: The ATW-49CB Antenna Combiner requires +12V DC power from any Audio-Technica 4000 or 5000 series receiver or +5 to +14V DC from any wireless receiver or antenna distribution system that offers antenna power. A light on each Active Antenna Combiner indicates that power has been correctly applied.