So long as your area gets Freeview HD then yes, just plug in your aerial lead and off you go.
Pop in your postcode here...
http://www.freeview.co.uk/HD
(We still have to wait until March next year in our area.)
I also suggest you check to see if you need a digital terrestrial TV aerial fitted, unless you have already done so.
Many people get sufficient signal strength from an old style aerial, but if reception in your area is a bit 'marginal' then you risk what has been dubbed the "
Digital Cliff-Edge". (Analogue signal quality falls off progressively whereas digital reception is fine until it has dropped to a certain threshold whereupon it all suddenly falls apart!)