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But receiving FM doesn't matter. Tons of things can receive FM that don't broadcast, like tooth fillings.
Corporate rules rarely care about logic.
Tooth filings pick up AM, not FM. Assuming that’s even a real thing. All you need get AM is a diode which can be made to varying levels of performance with a number of common materials.
FM radios generally use superheterodyne receivers which generate a radio frequency to be mixed with the incoming signal to pull out audio.
This receiver does emit a small amount of RF as a result and it’s how the TV police in the UK would catch you for skirting a TV license.
TV licence people were never capable of detecting TV like this. They just assumed everyone has a TV but not everyone pays for the licence. So would pursue people without a licence.
They’re main detection technology was looking in peoples windows and intimidation to gain access to their homes.
You should update this article: https://en.m.wikipedia.org/wiki/TV_detector_van#Detection_techniques