Sennheiser AWM UHF Wallmount Antenna for Evolution Wireless Digital Microphone Systems (UHF II: 823 to 1075 MHz)The Sennheiser AWM UHF Wallmount Antenna is designed to enhance the wireless performance of your Evolution Wireless Digital microphone system and can be installed quickly and easily in any room, on a vertical wall or horizontal ceiling surface, on a mic stand, or on a VESA 100 mount. The AWM UHF can be connected to any stationary Evolution Wireless Digital receiver or EW D ASA antenna splitter. It features adjustable gain settings of 6, 0, +6, and +12