Shure UA874 Active Directional Microphone Antenna with Gain Switch

The Shure UA874 (UA874US) is a UHF active directional microphone antenna with a built in amplifier that delivers improved wireless reception. The UA874US works within a 470-698 MHz frequency range, and uses a log periodic dipole array to produce a cardioid pattern towards the desired coverage area with greater rejection of RF signals outside the coverage area when compared to standard ½ wave omnidirectional antennas. An integrated amplifier with four gain settings compensate for varying degrees of coaxial cable signal loss. The UA874 can be stand-mounted, suspended from the ceiling, or wall-mounted using the included swivel adapter bracket.

Features and Benefits:

• Compatible with all Shure wireless receivers and antenna distribution systems that provide 12V DC bias*
• Four-position gain selector switch
• 470-698 MHz frequency range

• Low-noise signal amplifier compensates for transmission loss in coaxial cable
• Integrated threaded adapter mounts easily to microphones stands
• Legendary Shure build quality and reliability

The Shure UA874US replaces the discontinued UA870

Will the Shure UA874US antenna work if DC power is not supplied to the antenna?

The short anwer is no.  The UA874US does require 12V DC power over the connecting coaxial cable in order to operate.  This power is supplied naturally via UHF-R and ULX wireless receivers.  As a workaround for SLX4 and BLX4R wireless receivers that do not supply this DC power on their own, SLX and BLX4R receivers can be routed through an antenna distribution unit such as the Shure UA844SWB or UA845SWB which does supply power to the UA874.

Additionally, it is also now possible to provide DC power to the UA874US via the UABIAST when using SLX4 and BLX4R wireless receivers.