Off Center Fed (OCF) Antennas Off Center Fed Antennas Bullet 50:200 (4:1) HF Balun, 1.8-61 MHz, 500 Watts PEP, Loop, OCF, ZEPP 59.95 USD Ladder Line to Coax Interface Cable - G5RV, ZEPP, ZS6BKW, Loop Antennas 49.95 USD Off Center Fed (OCF) 4:1 Balun and Choke Combo, 1.8-61 MHz, 1.5/3/5KW PEP Options, Loop Antennas 99.95 USD Simple Dipole Feed Line Choke - RG8X - RFI Range: 1-100 MHz 10 USD 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,