Thanks for the reply.
If I mount the antenna on the garage, where it will be blocked by trees, will the difference in performace be substantial? I'm torn because I know cover isn't good, but it negate almost all visual impact.
My neighbors would probably call the FBI on me if I mounted a 9' long antenna on my roof. If I put that antenna on top of a 10' pole on the peak of my roof, they might just burn my house down