IIRC, in the
UK they have mobile units that wander around trying to
see how many televisions each home has (?)
I remember reading about that some time
ago (decades?), and wondering
since then how much that whole thing had gotten messed up since
computer monitors had come into the picture.
Probably not much; very few computer monitors use resolutions as coarse
as a TV's, so the signal thrown will be distinctively different.
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