> If the perimeter of the hole is < 1/2 wavelength (or so),
then it will
> shield fairly well. The real challenge for building a
shielded room would
> not be propagation through holes, but signals carried on
wires penetrating
> the shielding wall.
I don't think "shield fairly well" paints an accurate
picture of what it could do.
"Might reduce magnetic flux in a small area around the loop
axis " would be a better description.
I can't imagine anyone doing that for lightning protection.
You'd be better off burying the copper and using it for a
ground if lightning protection is the goal.
73 Tom
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