I had considered the solar storms and I don't think that's the issue. If so, I would expect the signal to drop on the open road as well as under tree cover. In addition, I've had this issue since I got the truck a month ago. My issue is that it tends to drop in anything other than ideal conditions. Case in point: I pull my truck into a shady spot for a full detailing this weekend. My shade is being provided by a patch of trees to the south. Directly overhead and remaining three side are pretty wide open. My satellite struggled so much with the signal that I finally gave up and went to CDs. As this is my "spot" for detailing, I have used it countless times and never had this issue with my aftermarket satellite setup. Like I mentioned in my opening post, I don't think the antena is faulty or hooked up incorrectly. It does work if conditions are good. I just think that Nissan is using an inferior antena for their factory satellite.
Could be that I just got spoiled with my previous setup. Could be that it was exceptionally good and the Nissan setup is more typical. I guess that's what I trying to get a feel for. So far, it doesn't sound like many people share my opinion.