Joe you should be able to receive global channel 27 from just north of Cobourg if you do not have any large hills or obstructions between you and the lake.
Global 27 puts out a strong signal. Peterborough's CBC affiliate CHEX is on channel 12 and is going digital at the beginning of May.
Also CKWS channel 11 in Kingston is going digital on April 22. You can also try for CKWS 30.1 from Brighton, ON directly across the
lake, but it is a fairly weak signal.