You need the SIR-ECL1 receiver, $99 from sirius.com
Not sure about the cost, but I think its like $10 to activate the receiver, and then $12.95 a month. I don't know what a yearly fee is.
The tuner works great btw, I use one on my CD8445 //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif