[throwaway202302]

https://www.lightbluetouchpaper.org/2006/03/09/video-eavesdr...

Rather old one, where 25m was claimed. (Markus Kuhn).

Some like 200m were claimed by anons in random threads (https://www.mikrocontroller.net/topic/319197, in german), but that might have been related to CRT, not sure. They said they pointed antennas towards an office building.

All in all, the topic seems valid but unfortunately the discussions tend to be trolled.

One takeaway from the original link for me was to prefer displayport cable over hdmi/dvi. Yet, if the shielded connectors you have been referring to are easy to find, sounds good as well.

Absolute security is not possible, they say. Yet I wonder, can we have some sort of it at least outside a horizon of lets say 5 meters? Broadcasting the signals few meters/across the street/100m seem to be quite of a difference.