Off Center Fed (OCF) Antennas Touch Lamp RFI Kit Store / Touch Lamp RFI Kit AC Cable Noise Filter for Standard 120VAC Plugs - 1.4" ID AC Cable Noise Filter for Standard 120VAC Plugs - 1.4" ID SKU ACCF-1.4 $12.95 Buy Now 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,