Cut RF Interference and Extend Your Wireless Range Offering improved signal reception for both VHF and UHF wireless systems, the Shure UA874 leverages a log-periodic dipole array to deliver a cardioid pattern toward your desired coverage area. Thanks to its directional characteristics, the UA874 exhibits superior rejection of RF signals outside your coverage area compared to standard half-wave omnidirectional antennas. At Sweetwater, we also place value on this active antenna's integrated amplifier, which includes four gain settings to compensate for varying degrees of coaxial cable signal loss. Boasting flexible mounting options, the UA874 will elevate the performance of any Shure wireless receiver or antenna distribution system equipped with a 12-volt DC bias.Shure UA874 Features: Active directional antenna for VHF and UHF wireless systems Leverages a log-periodic dipole array to deliver a cardioid pattern toward the desired coverage area Exhibits superior rejection of RF signals outside the coverage area compared to