Incidentally, there are some televisions produced (I think) in the 1980s that cannot be readily converted. They have a single external screw to attach an antenna (instead of the coax port that Jay posted a photo of, or two external screws, that would take the adapter that 1inxs posted a photo of). I never understood how they worked in the first place. As far as I know, there were only a few of them, and they were specifically space-savers, i.e., those that mounted to the bottom of kitchen cabinets.
Anyway, with that very very minor exception, pretty much any television can be made to accept a converter.
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