Richard Clark writes:

On Tue, 19 Jun 2007 16:45:15 -0400, Chuck

I'm not trying to argue against your main points, but I have a problem
with this:

We ask them to jumper in an extra few feet of transmission line and
check their SWR. They usually are astonished that their antenna needs
tuning again. This is a slam dunk indication of common mode problems.

Unless the SWR on the line is 1:1, changing the length of transmission
line *will* change the impedance seen. Whether there is common mode
current or not.

73
LA4RT Jon