Boosts HDTV, VHF, UHF and FM stereo signals up to 30dB Used when your antenna is more than 100 feet from the TV, or when a single antenna supplies signals to several units including TVs, VCRs or FM receivers Adjustable gain control provides up to 10dB reduction of signal to prevent overload or allow custom matching of amplification to signal strength Switchable FM trap reduces or eliminates FM interference Power light shows when the amplifier is operating Automatic protection circuit guards against cable shorts and prevents damage to connected receivers HDTV ready Adjustable Gain