I am useing a XM roady,it,s easy to use and is very flexable.
You will need an antena,but they are small and can be placed any where.
Try going to www.myxmradio.com
Shortleg[Dave]
Walmart has a really slick portable XM radio and IPod combo that has its own antenna. Made by Panasonic I think. check it out. It will give you XM plus your own recorded stuff, and be in a package that doesn't require a lot of mounting concerns.
I know this is not the right place but it goes with the thread. I have a Rhoady II with the in home unit (this part never used) for sale. $100. get all you need to get the hook up.