Sounds like OCFD stands for "Obsessive Compulsive Frequency Disorder" !! Ha ha I recently got a Palomar 4:1 OCFD balun and lots of wire to make a 160 one, but I'm so confused I'm just going to put up a new good brand 80-40 trap dipole I bought. 73 Mike K4QET --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus