FOR HEAVEN'S SAKE - there is NO SUCH THING as a DIGITAL aerial. They are all the same, albeit you will need one of the wideband variety to make sure you can receive channels wherever you go.
At the moment Border, Granada, Wales, and the south west, along with some of the northern Scottish islands have been digitalified. If your TV does not have Freeview built in then you will need a set top box to go with it.
If you want certainty of TV reception pretty well wherever you are consider getting satellite. It is not expensive and once you've done it a couple of times it's a doddle to set up. For the whole of the UK get a 60cm dish minimum.
Per the other comment, I have been on sites in Europe which are limited to 3A!!!