Off Center Fed (OCF) Antennas 25:1-81:1 Baluns/Ununs Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/25:1-81:1 Baluns/Ununs 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,