Press release:  Sirius Canada CEO: 1 Million Subscribers Exceeds Expectations:  Sirius Canada has exceeded 1 million paying subscribers across Canada after four years of operation, the company announced Jan. 12 2010.

I believe the Radio broadcast service is used mainly by cars.
Here is what the orbit looks like:

Other views of the orbit see here https://www.heavens-above.com/orbitdisplay.asp?satid=26626

Best regards, Eric.