well i think it depends on
a) if you need the additional resolution pc monitors would offer
b) if you can deliver output to them
@ b): depending on how many screens you need and if you need all of them to show different content, your best bet would either be multiple graphics cards (attention issues with video over dualscreen) or a matrox dual/triplehead2go or a combination.
as you would normally render out to a vga socket it would be easier to connect monitors, if you’d connect tv’s you’d need a downscaler for every tv to get a composite/cinch signal.
simple signal splitters are available for both vga and composite relatively cheap. matrix switchers (oder “kreuzschiene”) in vga get quite expensive.
if you can get video in via an antenna i don’t know, but heavily doubt it, you’d need a video socket (normally yellow cinch or the big SCART). if you can connect a VCR, you’re good…