Rohan McLeod wrote:
The Wikipedia article seems to have basically the right idea; it starts with static charges in hollow conductors; then talks about static charges in earthed hollow conductors. [...]
I was actually thinking particularly of | [...] they shield the interior from external electromagnetic | radiation if the conductor is thick enough and any holes are | significantly smaller than the wavelength of the radiation. So work out what the wavelength is for 3G or LTE or whatever, get mesh of the appropriate gauge, fold it in half and sew it together. As to sourcing a bolt of fabric with pre-impregnated with the appropriate mesh, that's what the ddg.gg link was for (since I cannot vouch for one myself). I doubt spotlight is hipster enough to stock something like that, but you could always call and find out. Further: | A booster bag (shopping bag lined with aluminium foil) [...] is | often used by shoplifters to steal RFID-tagged items.^[4] ...sounds like a solution you can test without any special equipment, by getting off the sofa and walking into the kitchen. Note the "booster bag" article further clarifies that multiple layers of foil are apparently used. The Talk:Faraday_cage article also mentions people testing cellphone reception from within an (inactive) microwave oven's faraday cage; this may be a useful reference point.
https://duckduckgo.com/lite?q=cell+phone+faraday+cage They seem very confused at duckduckgo;
ddg.gg is a search engine -- like google except http://dontbubble.us and http://donttrack.us I'm not enthusiastic about them, but they appear to be the least-worst option in terms of general underhanded asshattery. Obviously some kind of decentralized, federated solution is preferable, but AFAICT that is... nontrivial. (Actually I search with wikipedia first, then ddg.gg, then google.) PS: I think searching from the front page POST form gives fancier results than my link above; I use /lite because my browser ignores fancy-pants shit.