This is normally done by installing a TV tuner card in your computer, as well as the associated software for recording, viewing, etc.
However, with a laptop, that may not be possible. You'll probably have to use an external TV tuner and plug it into a USB port. Either way you'll need both hardware and software that are designed for each other.
With a Google search you can probably find many suppliers and prices. Just be sure that the software has recording capability (most do). I use an internal ATI TV Wonder card in my desktop system, but ATI (now owned by AMD) also has external solutions including a USB stick version which would be ideal for a laptop...
http://ati.amd.com/products/atitvwonder.html
Regards
...Charles