Greetings: your TV fool report indicates that the Cincinnati transmitters are less than 20 miles from you, but the terrain between the transmitters and your location is obstructed by hills. IO have had a bit of experience installing antennas in Cincinnati, and know that, in the analog days, channels 5,9, and 12 usually came in fairly well, but FOX, PBS and other stations were usually quite a bit more difficult.
These days, almost all of your signals are on UHF, with the notable exception of WKRC, which remains on channel 12. Additionally, the Dayton stations are available to you if you aim your rooftop antenna north of your location.
If the Cincinnati-Northern Kentucky stations are all you are looking for, I suggest using a Winegard HD-7695P mounted on your roof aimed at roughly 265 degrees, as measured by your compass. If you would like to see the Dayton stations, you should add an antenna rotator like a Channel Master 9521a to your antenna to allow you to turn the antenna towards Dayton when you want to watch those stations. I also suggest a high-input preamplifier like a Winegard HDP269 mounted on your antenna mast, with the power supply mounted in a central location inside your home. Install an appropriate-sized coaxial, power passive splitter after the preamp power injector, then run the coax cables out of the splitter to the various TV sets in your house. Once completed, you will see reliable reception of all the major TV stations in your area. Here are some links to help you, including a good antenna installation guide.
http://manuals.solidsignal.com/AntInsta ... ampaign=CJhttp://www.winegard.com/kbase/upload/HD7695P.pdfhttp://www.winegard.com/kbase/upload/WC ... DP-269.pdfhttp://www.solidsignal.com/pview.asp?p= ... 000-3AP-GX)
http://www.solidsignal.com/pview.asp?mc ... ote-Contro