These antennas complement Mobile Mark''s broad line of antenna products for Cellular applications.The RM3 Dual Band is a medium profile (3" H, 76 mm) antenna with performance of 3 & 5 dBi max (frequency dependent). A ground plane is required to maximize gain. The antenna radome consists of black ASA UV resistant plastic, with a heavy duty metal base and threaded feed thru, or a direct N version is also available.The bottom of the RM series is outfitted with a gasket for complete sealing. A mounting nut is provided. Magnetic mount versions, MGRM-900/1900 allow use without drilling a hole.The RMM-UMB is a broadband version capable of simultaneous operation on worldwide bands from 750 MHz up to 2.7 GHz, with excellent response.A direct N version is also available along with the standard surface mount.Note: Groundplane required for optimal performance.