That TV Fool Report is challenging.
However, it is only resolved to the block level, so it may or may not be accurate.
Also, it does not show any height above ground.
Create and post several TV Fool Report by following these directions:
http://forum.tvfool.com/showthread.php?t=14508
Create one at the logical height of the antenna (roof level + 5'). Then create another one at 50 foot. After you click on "Make Radar Plot" post the links to both. You probably won't put an antenna at 50' but that will help those giving advice whether an increased height would significantly help.