This pair of Sennheiser HALF WAVE DIPOLE 1/2-wave antenna rods are designed for use with EW-D EM receivers or the EW-D ASA antenna splitter. Offered as an upgrade from the 1/4-wave antennas that come with the receivers, they provide added range and reliability for your mic wireless system. Each antenna rod is equipped with a swivel BNC connector. This version is for the R: 520 to 608 MHz frequency band.