Hi,

You would require a TV Tuner card to watch TV on the system.
The reason being TV tuner is a device that enables you to connect an analog or digital
TV signal to your computer. Without a TV tuner, you cannot watch and
record live TV in Windows Media Center.
Also, Windows Media Center supports a wide
range of TV signal types, including antenna signals, cable TV signals,
and satellite TV signals. The type of signal you can set up is
determined by the type of TV tuner you have installed on your computer,
the area in which you live, and the cable or satellite television
provider you subscribe to.

Hence you can opt for tv tuner cards like Haupage which is a USB TV Tuner card and can set up TV and watch and record live television using Windows Media Centre.

Hope this helps and clarifies your doubt. Happy