"Probably not if it were made of dry wood. If really close to the
antenna it would behave much like the plastic insulation/dielectric on a
wire requiring the wire/antenna to be shortened a bit, but I doubt you'd
be able to measure any attenuation"
For some reason you totally ignored my next sentence:
'The amount by which it would attenuate it would depend on factors such
as size, material, thickness, frequency and so on.'
It is certainly true that the attenuation could be very small. It is also
true that building such a box would be an exercise in futility.
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