The Sennheiser ADP UHF (article 508863) is a passive directional paddle antenna covering 470 to 1075 MHz, so a single antenna model works across nearly every Sennheiser UHF wireless microphone and in-ear monitor range. Pointing a directional antenna at the stage instead of relying on a receiver's whip antennas improves reception range and rejects interference from behind, which is why rental companies, churches and theatres use a pair of them with antenna splitters or receivers placed off stage. The ADP UHF has an opening (apex) angle of about 100 degrees, a typical gain of 5 dBi, a front-to-back ratio greater than 14 dB and 50 ohm impedance. It connects with a BNC female socket with no DC path, so it needs no power, and has 3/8-inch and 5/8-inch threads for mounting on a microphone stand or tripod. It measures 319 x 310 mm and operates from -10 to +55 degrees Celsius. Sennheiser covers it with a two-year warranty.