2011 XC90 Sirius RDAR Location

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Hello,
I need help to locate the sirius rdar in my 2011 XC90 3.2 w 7 seats.

I purchased this one last year. After parking there for a week at Christmas, the battery was dead. I jump started it and ran for about 30 mins. The next day I got an alternator failure, which cost me about $1300 including parts, labor, and towing. I searched online and learned the low battery may damage the alternator and the sirius rdar keeps draining the battery. Since then, I've made sure the car was driven at least twice in a week. However, today the battery died again. I've removed the battery and I'm charging it with a charger. Google tells me one can fix it by install a brace to the sirius rada. But I can't find where it is. Could anyone give me an idea? Thanks a lot!