So it's entirely possible that TV Fool has provided you with a signal prediction that is reasonably accurate and the obstructed mounting location close to the ground leaves you with little useable signal.
If you can afford about $30 worth of hardware from Home Depot, you can make a guyed mast 10' or 20' high. Their
fence top rail makes an adequate mast. Combine that with some 1/4" Dacron rope for guys and you can at least 'test' the reception at 10' or 20' AGL.