For what it's worth, SiriusXM reception has gone down over the past years - could be crappier antennas, or signal changes, or sun spots...who knows.
I know the quality of satellite radio has gone down the crapper as the have plexed more channels. I have recordings of Satellite radio from 15 years ago, and it's night and day compared to today. Since the merger, they have gotten worse and worse. Even worse, the content has dropped enormously (in amount and variety), it's really too bad.
There is a good market for their service, but they fumble the execution. Also, car makers do a horrible job - they present a very limited interface in the car.
HD Radio (FM) is so much better, it's ridiculous. But still reception issue. But too little too late?