The AB 4-GW Antenna Booster from Sennheiser is an updated version of the AB 3 antenna booster. It is designed to accommodate the wider switching bandwidth of the evolution wireless G4 system. The AB 4 is a filtered, inline antenna booster module with BNC connectors that offers +10 dB of boost to compensate for signal loss created by long antenna cable runs. It is fully compatible with legacy G3 evolution wireless systems and supports tuning bandwidths up to 88 MHz now offered with the ew 300 G4 and ew 500 G4.