said by BF69 Also he can get a outdoor antenna that's necessarily a rooftop one. With UHF higher is not always better. My best signals on UHF come 2-4 feet off the ground. [/BQUOTE :
Higher is generally better for VHF/UHF. The catch is that tress and other objects attenuate the signal and also produce reflections.
So in your case you may just have found a "sweet spot."
In my case my antenna has to be at 70ft on my 86ft tower to work.