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Originally Posted by ThomasMc
It has nothing to do with windows, Harry. An ungrounded Faraday cage is an antenna.
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You're confusing the inside and outside of the Faraday cage. Clearly, the electrical potential of an ungrounded Faraday cage can vary with respect to ground, and hence it can be used as an antenna, while that of a grounded Faraday cage won't. However, that doesn't get around the fact that the electric field *inside* the cage will be zero in both the grounded and ungrounded cases.
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Put a radio next to a metal window screen, and you'll get better reception. That was a trick I learned in the 70s, with my short wave radio. It isn't because the radio waves are passing through the little holes, they are smaller than the wavelength of the signal. Ground that screen, and you have the opposite effect, the signal is blocked from that direction, and you have a weaker signal.
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That's got nothing to do with Faraday cages. A metal window screen is not a Faraday cage - it doesn't completely enclose the radio.
/JB