Kalico wrote:


But there is virtually no chance of detecting a TV that does not have
the aerial lead connected.

There is a big difference between what can be done, and what actualy is.
Go and do a web search for "Tempest enclosures" - i.e. the sort of kit
used to keep spooks from evesdropping on your video / computer screens etc.

The linescan output, and that of the local oscilators in a typical TV
demodulating circuit are all easily detected with the right kit. Not
only that, but the nature of the signals makes them quite conspicous.

--
Cheers,

John.

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