Only answer is a good aerial, I'm afraid, or cable.
Not worth sticking with analogue signals, best bet is to get a freeview box or computer freeview TV card or dongle tuner, as mentioned above.
Couple that with a good aerial and should be ok.
Or, if she doesn't have freeview (digital) viewing capability at the moment, existing aerial may be ok with new digital box.
You can pick up a freeview box for about thirty quid if you shop around though a more common price is £50.00.