Replacement Dual Band R1 and RDH-X Antenna is a dual-band antenna suitable for R1 and RDH-X radio. This antenna, which measures 6.25in tall, can be easily screwed on when a replacement is needed. It operates within the performance range of 136-174 Mhz and 400-480 Mhz. It is fully compatible with both the R1 and RDH-X radio.