Buy from Amazon : br br Shure UA874US Active Directional UHF Antenna with Gain Switch (470-698 MHz) br br Compatible with all Shure wireless receivers and antenna distribution systems that provide 12V DC bias br Four-position gain selector switch br Low-noise signal amplifier compensates for transmission loss in coaxial cable br Integrated threaded adapter mounts easily to microphones stands br Legendary Shure build quality and reliability