Jenniqua,
Go here to see which direction the tower near you is pointing:
http://inukshukjv.mapanswer.com/Rogers/main/index.do
login: rogers password: rogers make sure you click ANTENNA so you can see exactly where they are and what direction they are pointing.
From what I hear you can be up to 15 kms away from the tower if there is a transmitter pointed towards you, while some people cant get a signal 2 km away from the tower if there is no transmitter pointing towards their general direction.
Keep in mind, line of sight is very important for these modems to work. 2.5ghz is a very tight wavelength, so you'll need a fairly good line of sight at the tower, although it CAN go through a few trees or small hills. If possible, put it up on a tv tower or some other sort of pole. The higher you go, the better with these things..