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
Now you can get a ferrite snap on combo pack of 8 RFI filters in 3/4" ID size with all three filter ranges (great if you don't know the interfering frequency and need to cover the entire range when troubleshooting an RFI problem).
Mix 75 covers 150 KHz to 10 MHz (2 filters)
Mix 31 covers 1-300 MHz (usable to 500 MHz) (4 filters)
Mix 61 covers 200-2000 MHz (2 filters)