penguinface
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"A common misconception is that a Faraday cage provides full blockage or attenuation; this is not true. The reception or transmission of radio waves, a form of electromagnetic radiation, to or from an antenna within a Faraday cage is heavily attenuated or blocked by the cage."
https://en.wikipedia.org/wiki/Faraday_cage
Also, as mentioned above, tests carried out by the police were said to be "inconclusive" as to whether a bin lorry (often with a partly open back and even if not, certainly not a "fully enclosed" metal box) would act as a Faraday cage or not.
https://en.wikipedia.org/wiki/Faraday_cage
Also, as mentioned above, tests carried out by the police were said to be "inconclusive" as to whether a bin lorry (often with a partly open back and even if not, certainly not a "fully enclosed" metal box) would act as a Faraday cage or not.