Extra power The RA4000 B/EW is an active omnidirectional wide-band UHF receiving antenna for use with wireless microphone systems. It operates in a frequency range from 470MHz to 952MHz, providing a covering angle of 360° and a total gain of 18dB. The RA4000 B/EW has a built-in amplifier to compensate long cable runs. With dedicated antenna components, it works for cable lengths up to 300m. The RA4000 B/EW is remotely powered through the antenna cable. The antenna has waterproof construction and can be used for indoor and outdoor applications. Using the included universal stand adapter, the RA4000 B/EW can be mounted on floor stands with 3/8" or 5/8" screws.