The Diamond RH789 is an omnidirectional telescoping antenna for 95 MHz to 1100 MHz. There is a hinge at the base. It acts as 1/4 wave from 95-300 MHz and a 5/8 wave from 300 to 1100 MHz. It can be used for transmit up to 10 watts. This black, six section antenna is 7.9 inches retracted and 31.7 inches fully extended. Gain is 2.15 dBi from 95-300 MHz and 3.2 dBi from 300-1100 MHz). It terminates in a male BNC plug. 50 ohms.