The Sennheiser AB 4-GBW is a filtered, inline antenna booster/amplifier module with BNC connectors, designed to offer typ. +12dB of boost to compensate for signal losses created by long antenna cable runs.
 
The AB 4 is fully compatible with all legacy evolution wireless systems. Additionally, the AB 4's filters have been expanded to support the bandwiths up to 88 Mhz. The Sennheiser AB 4 antenna booster is available for hire from HD Production now, along with a large inventoryof wireless production equipment.