I am a little confused on the XM capabilities of the receiver, can you get a small module to plug in the back for XM connectivity or do you have to use the whole docking station/radio to use XM with it? I have a Express R unit that used to be in my car then I upgraded my stereo and bought an XM module to make the service work through the head unit, can I get something like this for the Denon?

Sharp Aquos LC60LE650U/Onkyo TX-NR5010/Axiom M100/Axiom VP150 v2/Axiom EP500 v2/Axiom QS8 v3