You'll need to purchase a Sony Location Free base station and software (included). Try this link:
The Sony Location Free base station can transmit your TV, or most any video signal for that matter, to your laptop as long as it has the Location Free software installed, wi-fi capability, and is within range. It can also transmit your programming over the web so you can watch via broadband and not even need to be home! The only drawback I have experienced is that if the signal is not strong enough, there is a choppiness to the video stream (not unlike watching videos online sometimes), and there is a 4 second delay due to encryption/decryption, but this really does not matter if you're not watching a "live" feed.
I have installed these units for clients and use one as well from time to time to watch TV from rooms without one. Good luck and hope this helps!