How do radio stations know that you’re listening to them? Is there a signal sent back somehow?
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Well, it is possible to detect some use of electronics if they give off some sort of electromagnetic signal.
[Van Eck Phreaking, ](https://en.wikipedia.org/wiki/Van_Eck_phreaking?wprov=sfla1) for example. Which is why your password is ****** on the screen.
The UK used [television detector vans ](https://en.wikipedia.org/wiki/TV_detector_van?wprov=sfla1) – which may or may not have actually worked.
There is really no way for a radio station to know for sure. They do sampling and statistical analysis.
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