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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Tones H3:
Im confused. SO the XM antenna IS integrated with the onstar antenna? My XM cuts out every once in a while. (Brief pause & hiss) Does this happen to anyone else? I wonder if it's just my location?? </div></BLOCKQUOTE>

Yes, the are incorporated, and yes, XM does cut out depending on where you are.
Under metal like in a service station or a drive-in restaurant, in hilly territory, and for some odd reason, places you would never imagine.
There are two XM satellites, one in the southeast, one in the southwest. In addition, large urban areas have earth based repeaters to cover dropouts in large cities due to tall buildings.
My SCIFI II in my Jeep and my old Audiovox in my Vette dropped out a few times, mostly for reasons noted above, but sometimes for no apparent reason. My H3 XM dropped out a few times in the hilly area of TN. In TN, there was always a mountain between me and the south, so the mountain was probably blocking the signal.

There are also places that for no apparent reason, XM drops out. One in particular is located in Franklin TN. When in TN earlier this year with GM, we had some complaints about factory units dropping out. I got curious and in two days drove both of my vehicles (Jeep and Vette) to this location, and my XM in these vehicles dropped out. No metal structures, no hills, no nothing but air, yet no XM signal. Strange, but no one had an explanation.

Looking at your plate, I believe that is PA, there are mountains in PA, if you are near mountains, you may have drop outs.