Wow, seems like every carrier is present there. Isn't there a lower set of panels on the second tower from the left, which would make it 7? I might be mistaken, but from the picture, it looks like there's something else there.
Andy, I am truly glad I have you to keep the counts straight. Yes it is 7, my mistake, although I cannot come up with 7 providers in that area, I have to keep investigating.