this post was submitted on 16 Oct 2025
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https://en.wikipedia.org/wiki/TV_detector_van
You can't really detect "TV signals", but you can quite easily detect the 10.125 kHz horizontal line-scanning deflection coil of a CRT. Though I'm fairly sure even if they did originally start effective back in the 1950's because people had very few elecronic devices around, actually detecting anything accurately must have been increasingly difficult as time went on, and a lot of the newer models must have been more about being a scare tactic.
The German version of that very article says it's not possible. Now what? w(°ｏ°)w
Uh, really? The English version is pretty convincing that it is- it even lists three different methods they used over the years. The sources seem convincing, but I'm quite literally judging the book by it's title there.
I know so very little about all this, I can only take people's word for anything. ¯\(°_o)/¯