Ditched Sky 18 months ago, go get a freeview box from Argos, about £15-£20, try it at home if no good take it back under the 30 day trial!
Digital signal is currently turned down so it don't interfer with the analog while most peeps are still on the old system.
As each area becomes more digital dominant, the analog signal will go anyway, think whole country has to be changed over by 2012???
Your ariel needs to be pointing at the best transmitter, could be more than one in your area, I did it ages ago, you can google where your nearest one is, get the compass reading for it & move the ariel around to the right compass reading.
We do not miss the sky at all, and er-in-doors is a sport nut, will watch anything football, cricket, tennis, winter olympics whatever

, while I go do some cooking or reading.
Save the cash for fuel !!!!!!!