The Shure UA870WB is a professional active directional antenna designed to significantly improve the reliability and range of wireless microphone and in-ear monitor systems operating in the 470-698 MHz UHF band. It is engineered to address challenging RF environments where weak signals, multipath interference, or long distances between transmitters and receivers are problematic. The antenna features a log-periodic directional array, which provides high gain and focuses its reception in a specific forward direction, allowing operators to "aim" the antenna at the signal source for optimal pickup while rejecting interference from other directions. The integrated, low-noise amplifier (active component) boosts the captured signal before sending it down the coaxial cable to the receiver, compensating for cable loss and maintaining a strong signal level.

The UA870WB is built for touring and installed applications. It includes a rugged, weather-resistant housing for outdoor use and features adjustable mounting hardware for easy positioning on a stand, truss, or wall. It requires phantom power (9-15 VDC) supplied from the connected wireless receiver or an external power supply via the coaxial cable. By extending system range, improving signal-to-noise ratio, and providing directional selectivity, this antenna is a critical tool for ensuring clear, dropout-free audio in large venues, complex multi-system setups, and environments with heavy RF congestion.