[aorist]

In the U.K., owners of televisions receiving broadcast signals (and now VoD) are required to pay for an annual license. The enforcement of this is mostly through sending letters, but there are also TV Detector Vans [0] which work in a similar way to TEMPEST — or at least, that's allegedly how they work because there's some debate about whether they really exist or if they're just a PR tactic.

[0]:https://en.wikipedia.org/wiki/TV_detector_van

[greggarious]

I spoke to someone from your government at a party once. It's largely a ruse now that people rarely set up rabbit ears. (I'm not even clear if they broadcast anymore, they don't do over the air broadcasts using that tech in the USA anymore)