Sorry for missing this. It's supposed to take the standard SiriusXM box but there are conflicting reports on whether the antenna is pre-installed on the Georgetown's. Perhaps you already know and can comment.
Sometimes SiriusXM has a rebate on that box as long as you don't buy it from Sirius, Best Buy or Amazon.
Last year SiriusXM added the streaming app to some of their plans at no extra charge. So I just use the phone app and stream it via Bluetooth to the XRV10.
The Bluetooth on the XRV10 is a bit flakey and sometimes streaming stops. I found I can just turn Bluetooth on the XRV10 off and back on and it starts working again. That usually happens after we've been sitting somewhere and not while using streaming.
I also found I could dramatically improve the XRV10's sound by removing each speaker and stuffing some home fiberglass insulation behind it and on the top and sides, effectively building a "fiberglass box" for the speaker to sit in.
That doesn't leave much room for air but at least the road and wind noise from the speaker being open to the outside wall is knocked way down. It does make it have more bass so you'll need to tweak the equalizer. The radio is easily understandable and doesn't sound too bad now. Before the insulation it sounded very mushy and was almost unusable at highway speeds.