Hustler HQ27B 55-Inch Steel Power Packer CB Radio Antenna (Black) 55-inch stainless steel whip antenna. Mil-Spec Polyolefin BLACK sheath Field tunable. 3/8 inch x 24 threaded Chrome platted top & bottom fittings. 17-7 PH stainless steel whip and lower rod 50 Ohms impedance. 27 MHz CB Center loaded. 1/4 wave design