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I wonder if that shielding would show up in WiFi imaging techniques.
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True...but I suppose such shielding may make it harder to disguise...maybe...I don't know. In any case, I wonder how it would do in noisy environments (a couple of computers and phones in the room).
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Exactly. Professional grade equipment already has extensive shielding to mitigate non-linear junction detectors.
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Would a typical airbnb perv have the know-how to produce a professional grade setup? E.g. they'd only have to screw up once to be detectable by this system.

A consumer-grade device to perform a quick run over my hotel/airbnb that detects 90% (or even 50%) of hidden cameras would be useful because the status quo (doing nothing) detects ~0%.

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