Think you need a standard aerial which is capable of picking up the signal. Some older aerials may not be able to receive the signal but most can pick up the feed. We recently hooked a freeview box up to an aerial which was put up by the previous tennants over 8 years ago and it picks the feeview feed up fine.
http://www.freeview.co.uk/
http://www.freeview.co.uk/whatdoineed/aerials.html