alt Hacker News>I wonder if this could be done via wallpaper and printing using a conductive ink printed on the same pattern?
AFAIK they have to be grounded so it'll be a massive pain to install, even if you can get it printed.
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frollogaston • today at 9:46 PM
Just a typical metal mesh building material can do it. My friend has a house with an accidental Faraday cage like that. 0 bars unless you're near a window, 90% packet loss if you're near a window but not sticking the phone outside. Wifi only works if you're LOS to the access point.
Last I checked there was no consensus on whether or not a Faraday cage needed to be grounded to function properly, which seemed surprising.