[muxator]

Now this is really really cool (technologically; let's not talk about the implications for people's freedom).

Do you happen to have some pointer were read more about this? Thanks

[sneak]

It's probably one of these:

https://www.wikiwand.com/en/ANT_catalog

Likely TAWDRYYARD:

https://www.wikiwand.com/en/File:NSA_TAWDRYYARD.jpg

See also:

https://en.m.wikipedia.org/wiki/The_Thing_(listening_device)

[mikewarot]

It was TAWDRYYARD, but apparently I'm wayyy off in my recollection of it's range.

[mikewarot]

There are devices with longer range, I'm sure if the bandwidth is reduced, the range could go up.

[1] https://en.wikipedia.org/wiki/Ambient_backscatter