The Shure UA8 is a 1/2-wave omnidirectional dipole antenna that offers 0°, 45°, and 90° positioning for increased flexibility as well as enhanced RF reception and signal stability. It's compatible with Axient, UHF-R, ULX-D, ULX, SLX and BLX4R receivers and PSM1000 and PSM900 transmitters (based upon frequency range - all sold separately).