TV's do give out radiation via the CRT tube. If you have a sensitive enough detector, you should be able to detect an operating TV. Then it would just be a simple matter of tringulation to figure out which house it's coming from. As I said, this is just a guess, since in the USA we don't have broadcasting fees, so we don't have detection vans.

Makes ya kinda wonder if you could get a TV Detector Detector, which would automatically shut off your TV when it detected the TV van going by ;)



> > > What do they contain? Do they do anything at all?
> > >
> > > I recieved a letter today telling me, incorrectly, that I haven't got a license. I can understand how they could check for a license, but how can they check for a TV?
> > >
> > > A (terrestrial) telly intercepts transmissions using an aerial. As far as I know, it does not broadcast anything. So how do those vans that stalk our streets work? Can an unlicensed TV actually be detected? Can a licensed one, for that matter?
> > >
> > > Tub"Big Brother is watching me, but he needs new glasses"ba
> >
> > I've only ever seen TV detector vans in British 1960s-era "Punch" cartoons. In NZ the moronic annual broadcasting fee was recently scrapped (yay!), but all the years it was in force, I have no idea how they knew who to send a bill to. I had a feeling they might pin down TV owners by some sort of mailing list supplied by TV retailers. But we had a succession of hand-me-down TVs obtained for free, and once we got a bill for one of them. Later, after buying a new TV from a shop, this never resulted in a bill. Now I wonder if it was completely random, on the assumption that just about every home has at least one TV, and since almost nobody ever pays the broadcasting fee, it's a safe bet *someone* at that address will be racked with guilt on receiving the dread notice.
>
> But I'm living in the campus accomodation
> now, single rooms in a tower block. I am the only one in my group to recieve a notice, but not the only one with a telly.
>
> Tub"We can lock the doors, so we need one license each"ba