***RG6 Cable is commonly used in HDTV Reception. Signal Loss for UHF Signal on RG6 is significant especially when the cable is 30 feet or longer.**** AT-PAU18 is designed to compensate this signal loss. ***This little Cost effecient baby is made by high quality components and delivers high gain and low noise performance, improving whole system Signal/Noise Ratio.*** This Pre-amp is supposed to be installed very closely under the antenna, in most senario, it is installed on the antenna master.****This is why Pre-amplifier is also know as Master Amplifier or Head Amplifier. *****!!!!DO NOT USE ANY PRE-AMPS!!!! if the cable in your application is very short(30feet or shorter). ****Try to get a larger antenna or reposition your antenna is a bettersolution.