Enrich your TV with pixel perfect HD channels. All you need is coverage in your area, a good signal from your aerial and a HDTV.
 
You can check which Freeview HD channels are available in your area with the Freeview channel checker.

If you have an BT TV Box Mini or are using a BT TV Box Pro in Internet mode, you will also be able to receive some HD Freeview channels without an aerial.