Rabbit,
I was looking at this link:
http://www.erico.com/public/library/fep/LT1476.pdf
Particularly, the second page and I believe I have that on the side of my house. When it is daylight tomorrow, i can check but just looking at the pictures on the second page I believe it to at least look pretty similar to what I have.
Is it safe for me to assume that you have your 91XG and C2V on the satellite mount that is located where the teardrop indicator is located on the satellite view of your house? It looks like it is on the East side of your house, about half way back from the front.
I don't have a photo of your antennas, so I'm trying to picture in my mind if you have both antennas on the same mast, and which is on top. I looked at some other map images to try to see how high your antennas might be, but I couldn't tell. My concern is whether the signals coming from the NE for the C2V are able to clear the roof of the house that is East of your house, because when I turn on the green signal lines for the interactive map, they cross the peak of the roof of that house.
Both antennas are using existing satellite mounts that were there already. The coordinates I gave you were pretty close to the area where both antennas are mounting. There is no mast in use that I am aware; just the satellite mounts.