BJTEK specialized manufacturer and supplier of SDAR/XM antenna. Welcome to visit our website to browse more SDAR/XM antenna. Performace enhancement for satellite digital audio radio systems with a switch circuit for an optional antenna. SDAR antenna, XM antenna could be applied to sirius radio and XM radio as radio antennas which are compatible car/ table/ portable radios and other kinds of radios. Welcome your inquiries or any other question about our radio antenna.