I just purchased a Sirius XM Onyx plus that I use in my office that is replacing an old Sirius Sportster that I had. I can't get a good signal. I only get 1 bar. I have tried aiming it everywhere possible out my windows and it does not help. Unbelievably when I point it to the wall next to the window I still get 1 bar but it is strong enough to at least listen to the channels. But for some reason I can't get the upper channels (talk, sports, etc). Anyways with my Sportster I would get 2-3 bars signal strength. Do Sirius and Sirius XM use different satellites? IS there such a thing as a signal booster to try and boost the signal? The way my office is there is no way to get the antenna outside. This is very frustrating. Thanks in advance for everyone's help.