I once read about someone who concealed a router on a wall and set up a completely hidden hotspot. Not just hiding the SSID - it supposedly didn't show up at all when scanning, so you had to know the network name, security and password in advance, and manually create a profile in your computer.
Is that actually possible? It seems too far-fetched for me since 1. I never saw an option to disable beacon frames on any router, 2. those are used by clients to know if you're still in range.
The closest thing I know to be feasible is using channel 14, which is only allowed in Japan. Most equipment made for America and Europe can't "see" channel 14 at all without using a modded driver or ROM, which means you'll also have to either do that or use Japanese hardware.
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