Is the height of the outdoor antenna critical or does it just need to be outside so it is not shielded be the siding, roofing, etc.? I have a shed near the house that would be much easier to install an antenna on but is much lower than the roof of the 1-1/2 story house.
Well, of course, the higher you have your antenna the better signal reception you are going to have. I am on the Northwest side of Kalamazoo and have an antenna on my single story ranch house, perhaps total height is 15 to 18 feet and I get all those offered in my area, including WZZM, with my OTA setup. Of course I have a very good mid-range antenna.