On Sat, 24 Nov 2007 23:41:19 -0800, Roy Lewallen wrote:

Owen Duffy wrote:
. . .
If you try something beside a shielded loop, make sure you use an
effective means of isolating the feed line from the loop so that pickup
on the feedline does not feed the receiver.
. . .

In my limited experience, it's extremely difficult or impossible to do a
good job of isolating the feedline from a small loop. The common mode
impedance is just too high.

Roy Lewallen, W7EL

Hello

How much (estimated) would this common mode impedance be for a 3 foot
diameter loop for instance 80 meter band?

Mario