Thanks for the additional info. It really does help.
My vents look pretty similar to
the ones on your house. Mine are square, but otherwise look pretty similar.
I'm trying to decide where best to locate the tripod mount. Do I understand correctly that tripod mounts are designed to straddle a peak? Or perhaps the proper term would be "ridge"? The line where two slopes meet?
I assume that two legs of the tripod will be on one side of the ridge, and one leg will be on the other.
My house faces south. My antenna will also be pointing south. I have a choice of mounting the antenna on a north/south ridge, or on an east-west ridge. I believe the prevailing winds come from the south-west. Is there any sort of preference between which way I orient my tripod?
I'll attach some pics. They're not very good, because I wasn't actually trying to get a shot of the roof when I took them. Note that both houses in the pictures are the same floor plan and have the same roof features. It seems like I can put the mount over that short ridge that runs sideways above the back face of the roof. Or I can put the mount over the ridge that runs to the front peak of the house.