Rick, Gosh, that makes sense but it never occurred to me. Thanks for that little bit of education. Jon On Sep 13, 2014, at 12:19 PM, Rick - DJ0IP / NJ0IP wrote: > That's because the VF of the coax only pertains to the current flowing > inside the coax. > Common mode current is flowing on the outside of the shield where the VF is > about 0.98, not 0.66.