Viewing free to air HD channels

[N!ck]

If you don't have Sky HD, yeah pretty much. Unless you have freeview HD/freesat HD built into your TV but I don't know if they do that.

Yeah, some do.

Freesat is just like Freeview but with some HD channels (and missing some standard freeview channels though).

[Jordy]

Freeview won't be HD for ages. Without getting a subscription, Freesat HD is your only choice.

Freeview is testing HD at the moment, however you wont' be able to receive it till 12 months after the digital switchover in your region. So that's 2013 if you live in London.