These popular omnidirectional antennas have been selected for use with repeaters, talk-around systems, paging systems, security alarms, VHF dedicated systems, 220 trunking systems, and in such applications as police, fire, agricultural and hundreds of others requiring reliability, long life and economy. Field tunable and easy to install, they can be mounted on any vertical tubular support up to 1-1/4 inch (3.2 cm) diameter. Ringo, Ringo Ranger, and Ringo Ranger II can be shipped economically by UPS. Field tunable and easily installed, the CRX-150 (150-174 MHz) and the CRX-220 (220-222 MHz) have 5 dB gain. Installation involves measuring the radiator length and tightening two clamps; the antenna is assembled just that easily. Add a simple adjustment of the tuning rod, and you're ready to go!