Off Center Fed (OCF) Antennas Bargain Basement Store / Bargain Basement Switchcraft 12B Stereo 1/4 Jack - 3 Conductor, panel mount, Vintage Mic Chassis Jack Switchcraft 12B Stereo 1/4 Jack - 3 Conductor, panel mount, Vintage Mic Chassis Jack SKU SW12B-1 $1.95 Buy Now OCF antennas are very convenient as they will allow multiple bands of operation with a simple wire antenna which is fed off center with a 4:1 OCF Current balun with built in feed line choke,