It depends on where you are, if you are near other transmitters, what antenna you have.
When I am mobile I have problems snagging digital signals from more than 10-20 KM's.
When I used to live in hamilton I snagged towers in Mississauga, T.O., Grimsby, Guelph but I was 17 floors up facing Toronto.
There are numerous peoples on here and on Yahoo from your area that can give u the 411 but in my experience with portables and regular antennas the coverage isnt that great.