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SHURE PA421B-E Antenna Combiner The SHURE PA421B-E is a premium antenna combiner designed for professional use with Shure wireless microphone systems. It combines up to four Shure PSM transmitters (PSM400, PSM900, PSM1000) into a single antenna, reducing interference and optimising wireless performance for large venues and live events. Key Features Combines up to four Shure PSM transmitters (PSM400, PSM900, PSM1000) into one antenna Wideband operation for broad frequency compatibility Robust RF filtering for high signal quality Active circuitry provides gain to compensate for signal loss Standard rack-mountable design for easy installation Front-panel indicators for real-time monitoring of TX inputs and antenna output Reduces signal clutter and number of antennas needed for multi-channel setups Supports both AC and DC operation with included power supply options Rugged construction trusted by sound engineers worldwide Applications Ideal for touring professionals, theatres, large venues, and fixed installations requiring reliable, clean wireless audio signal transmission.