Thanks for the feedback.
I'm not sure if it's a Del Webb home. It's about 40 years old. For the most part it's a well built home. Nothing fancy. The attic over the garage is a good 7ft tall at the peak so I had plenty of room. Mostly I wanted to test the concept and these were the materials I had on hand. I got it all put together right before a local net started. I had to dodge my mother in law who wanted to chatter about what I was doing. Anyway, it seems to work pretty well. I am hearing the drive through girl at the Chik Fil A a few miles away, local highschool football coaches, road construction flaggers etc. More importantly, I can now hit a few repeaters that were out of reach with my HT.
I am in a bad spot in this valley for reception otherwise. I am at the low end of the valley, right up against a curtain of mountains that block me to the East and South.
You have the altitude advantage with that third floor. What kind of cable are you using?