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Among a fringe community of paranoids, aluminum helmets serve as the protective measure of choice against invasive radio signals.
In electromagnetic field theory, when one solves for the distribution of a field in and around a conducting surface, one finds that electromagnetic waves do not penetrate very far through holes that are less than about a wavelength across. Equivalently, the reflection of electromagnetic waves from a conducting surface is not much affected by holes (or other irregularities) in the surface less than about a wavelength across. Therefore, it is possible to make a Faraday Cage or a satellite dish with 'holes' without materially affecting performance, provided that the holes are less than about a wavelength across.
Originally posted by Thomas Crowne
Your tin foil hat means nothing if you do not have it grounded.
I will not tell you how I do it as, if you attempt it and place the strap in one of the two NOT GROUND holes in an electrical outlet, you won't have to worry about "them" reading your mind!
The English chemist and physicist Michael Faraday, b. Sept. 22, 1791, d. Aug. 25, 1867, is known for his pioneering experiments in electricity and magnetism. Many consider him the greatest experimentalist who ever lived. Several concepts that he derived directly from experiments, such as lines of magnetic force, have become common ideas in modern physics.