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,
RFI/EMI Solutions from KHz to GHz
Ferrite Slip On Bead, ID = 1in/25.4mm, Mix 31
Application Note: use 5 turns of 1/4" coax for good feed line choke from 3-30 MHz, 5KW
Also useful for choking DC cables, large coax sleeve chokes