I may be a little biased, because, as Navyseal, I'm a shareholder, but Sirius is the real deal. The contract with the NFL is exclusive, each and every game. The cost is about 12 bucks a month, or as the above posters mentioned, you can pay for a year up front, or a lifetime subscription. If offers an absolutely ridiculous amount of stations, all commercial free, all great reception, and it blows XM out of the water (more sattelites for better reception, more channels, no pay channels, and of course the NFL), and it's coming out with new products almost everyday. The new receiver is about the size of a cell phone, so you can seriously listen to any NFL game anywhere. Plus, the website allows subscribers to listen online at any time (XM doesn't) just by clicking a link. Like I said, I'm a little biased because I'm a shareholder, but I wouldn't advertise/own part of a company I don't believe in. So, go, now.
"When I was a kid I thought I was going to be the starting centerfielder for the Boston Red Sox. Life sucks, get a f___ing helmet." --Dennis Leary