Actually, now that I understand what you are trying to do then you could do as Bob suggests ,if you just wanted to use the PC monitor for playing your PS2 and using with your PC.
If you are hoping to get away with watching TV on your PC to evade the TV licensing fee then you could do that with a TV PCI card, Aldi had some nice ones in stock a couple of weeks back for around £25 but they have probably all gone now, but there are various ones available from less than that to as much as you want to pay up to.
The Aldi card actually had Svid in as well as aerial(antenna for you Bob
) coax in.
You would still legally require a TV licence to watch TV in this way and I believe that the RF signal being reflected, back out along the coax according to Scrumpy Jack, would be detectable by the nasty TV licence detector people
As far as I know though, the people who come to check to see if you have a licence or a TV receiver in operation have no right of entry unless you invite them in, so you can just say "no I havent got a tv or anything capable of receiving it and you cant come in" and they cant do anything about it as theyhave to visually confirm that the equipment is actually in an unlicensed premises and is being used
Dont take my word as 100% accurate on that but I have heard a lot of discussions about it over the last couple of years on the radio and thats always being said