Go buy an elgato eyetv hybrid and update to their newest ipad frie dly software and then set up the necessary wifi requirements. Then purchase the iPhone app eyetv (which eyetv said an update will becoming in next couple weeks to be a iPad version as well) and you will be able to watch live tv on your iPad (though it's pixilated due to at the moment it's an iPhone app being doubled).
This app works almost flawlessly over wifi and can even stream with a bit of lag via 3G. I watch sports center almost every morning while waiting for students to come into homeroom.