UB-900ACT is designed to compensate signal loss on long antenna cables or passive antenna splitter. One UB-900ACT can compensate 10dB of cable attenuation which is about 20 meters of RG-58 cable. This product can be powered by power output from antenna distributor UA-960 / receiversí BNC connecter or AC / DC Adapter (+12V/0.5A). DC power supply is indicated by a red LED. Up to two UB-900ACT can be cascaded.