I see most faraday cage reviews saying the same thing: worked for a few months and has stopped working. If at first everything worked fine, then the malfunction is related to intensive use, as well as opening and closing the folding shutter. Faraday cages must be seamless to prevent signal loss. Normally this applies to hard ferrous metals. If you work a solid piece of metal back and forth, it will eventually fail. Here is an empirical study of the best products currently available. http://ro.ecu.edu.au/cgi/viewcontent.cgi?article=1165&context=adfThe black hole is penetrating at a great distance. I tested mine and it works very well. Even if I stand next to my Tesla with the lid open.
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