They might be in an otherwise radio silent part of the world though. And how hard is it recording the electrical interference of a device from the same room and then from other rooms, to establish the variability of its electrical "interference/signal" properties?

Knowing about the Theremin, a Russian electrical instrument invented in 1919, is similar to walking around a house with mains electricity is an audible example of the interference in our homes which we interact with. https://www.youtube.com/watch?v=-QgTF8p-284

Could even do human detecting wifi signals. https://discovery.ucl.ac.uk/id/eprint/10103371/1/Passive%20W...

If someone can detect multiple wifi signals, the are effectively inside a phased array radar system.

> They might be in an otherwise radio silent part of the world though

> Could even do human detecting wifi signals

I can confidently say that you have never tried to do anything with radio.

I've experienced it, because I have FE(II,III) in me, so have you.

https://web.gps.caltech.edu/~jkirschvink/pdfs/JoeMicrowave.p...

https://ui.adsabs.harvard.edu/abs/2019AGUFMGP23B0794P/abstra...

https://www.pnas.org/doi/10.1073/pnas.1613349113#:~:text=In%....

Still confident or have you spent too long on your mobile phone that you cant remember?

The quieter you become, the more you are able to hear.