It's possible, if you have repeaters nearby, but don't count on it. The best way to listen(maybe not sound wise, but best chance of constant/flawless reception) to Sirius/XM indoors is through a online streaming account.
Not trying to deter you from trying. I have found it in my own personal experience, that using an XM antenna indoors(birds are fixed in one position towards the South/SouthEast) is much easier than trying to find the Sirius birds, which are in constant figure 8 motion over the USA(I know both birds move).
I was able to get my XM signal(this is going back 5 years ago. I have had Sirius since then) using my indoor antenna pointed at the corner of a wall towards the South/Southeast nowhere near a window, and I would get 3 bars for full strength(on an Old SkyFi).
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