Off Center Fed (OCF) Antennas Off Center Fed Antennas Building your own antenna? Technical info on OCF Antennas HERE Bullet 50:200 (4:1) HF Balun, 1.8-61 MHz, 500 Watts PEP, Loop, OCF, ZEPP 64.95 USD MAXI-CHOKER Coax Line Isolator, 1-61 MHz, 3KW, SO-239 In/Out, 5K Choking 79.95 USD Off Center Fed (OCF) 4:1 Balun and Choke Combo, 1.8-61 MHz, 1.5/3/5KW PEP 129.95 USD Off Center Fed Dipole Antenna, 80-10 Meters, 1.5KW PEP rated - FREE shipping in USA 189.95 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,