Although I love my XM, their roady does not get the best reception or project the best radio signal. I would suggest getting a new head unit with a built in XM reciever or one with an attachment.

My current set up in the X is a Pinoneer DEH-MP9400 with a built in XM reciever and Auxilary jack. It get perfect reception for an old 1st Gen XM unit.
The Roady is in the other car.