Pulling Data From HDMI RF Leakage

A long-running story in the world of electronic security has been the reconstruction of on-screen data using RF interference from monitors or televisions. From British TV detector vans half a centu…

Hackaday
I mean… you have been able to do things like that for a long time. You used to be able to use cable toners to listen to conversations on analog phone lines for instance.
Hell, toner and probe is still a common diagnostic tool for telecom engineers.