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You can not simply watch TV on your laptop.
For a Desktop you can buy a card to go inside the Computer - For laptops there are USB devices, SEE:http://www.ehow.com/how_5278850_watch-tv-wirelessly-laptop.html
You can subscribe to say nexflix (just uder $10 per month), but this does also require an internet connection. This allows you to watch some TV series and to watch movies. Hula is an alternative site