The CBC Channels & Frequencies Guide will provide you with the location of the closest over-the-air CBC transmission tower in your area.
When Canada made the switch from analogue to digital television transmission, we weren’t able to replace all of the towers in our system to create the same over-the-air network.
In the end, CBC/Radio-Canada installed a digital transmitter for every one of its television stations, for a total of 27 transmitters across the country (14 for CBC and 13 for Radio-Canada). You can find a list of the towers and their channel numbers here. Each tower costs in excess of $1 million and there are no plans now to add more to the existing footprint.