Here is a device I made to do that: <http://www.qsl.net/k2vco/sniffer/rfsniffer.html> 73, Vic, 4X6GP Rehovot, Israel Formerly K2VCO http://www.qsl.net/k2vco/ On 9 Aug 2016 23:56, MaverickNH wrote: > Just wondering - short of +/- RF Burns and Audible Noice, can one readily > detect/measure Common Mode Current on a coax antenna feedline?