Actually... there are NO 'sat radio' antenna ports on the back, as there is no 'sat radio' tuner built-in. What it does have is an interface built-in for an external Sirius/XM tuner.

The SiriusXM website says the XM Direct Home Tuner is the only device left that can work with the direct interface on that Sony receiver.
Here is the link:
[Link: shop.siriusxm.com] XHD2H1_to_BXHD2H1