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 Binocular Bead, ID 0.250" Hole Dia (6.35mm), Length 1.130" (28.7mm) Width 0.561" (14.25mm), Mix 43 - excellent tor individual wire, small coax common mode choke or impedance transformer, 1 piece