1/4 wave,suitable for Frequency 500-900MHZ UHF wireless microphones; Oxygen-free pure copper core wire material for smooth transmitting without fuss & to the top quality performance for your devices; BNC aerial wire connector, easy to assemble to your wireless microphones receiver with the new replacement manually locked on; These replacement BNC Antennas are designed to fit 's, but also working on the wireless microphone with frequency 500-900 MHz, if your wireless receivers fit to BNC lock of the antennas properly. Therefore, these are not only do what the for 's do, compatible series of SM58, SM58S, SM58LC, BETA58, BETA58A, BETA87A,PG58, SLX4, PGXD4, , U4D,U4S,...also fit and operate it for , for , or other ' devices with smaller, unobtrusive antennas. Brand New and High Quality Steady, constant frequency. Applicable frequency band: UHF (U segment) The interface type: BNC (bayonet) Colour:black+silver Material:plastic+metal Package Contents: 4 x Microphone Antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.