Diamond Original MR73SA Dualband Mobile Antenna The Diamond MR73SA is a 2 meter and 440 MHz antenna with magnetic base. It is economical and unobtrusive at under 20 inches high. This antenna performs as a 1/4 wave on 2 meters and as a 1/2 wave on 70 cm. Gain is: 2.15/3.4 dBi. Please note that this antenna is primarily for HTs and can only handle 10 watts. This antenna is 19.5 inches (0.5 m) high and includes a magnetic base plus 9.8 feet of RG174 coaxial cable terminating to a male SMA plug. Weight is 3 ounces (80 g). Magnet mount/antenna combination. Coax: 9'10" RG174/U w/ SMA connector.