[Stuart]

The problem with what you are asking is simple. Unless you have a TV card, your computer does not contain the hardware necessary to recieve and decode broadcast TV.

Now, as I said, most TV channels do have live streams on their sites now, but these often contain copyright protection stopping them being used outside their website. Thus stopping you using them with other software.

There *are* programs around that can break this protection, but discussion of this is banned on the forum.