The Shure UA874 is an active, wideband UHF directional antenna designed to significantly improve reception of RF signals for Shure wireless microphone systems. It features an integrated amplifier with four gain settings (+12 dB, +6 dB, 0 dB, -6 dB) to compensate for varying coaxial cable lengths and signal strengths, ensuring optimal performance. Its directional (cardioid) pickup pattern helps reduce unwanted RF interference from outside the coverage area, making it ideal for large-scale events, touring, and installations where reliable wireless performance is critical. The UA874 can be powered by a Shure receiver or antenna distribution system through the coaxial cable.