GroundUrMast:
Here's the TVFool report at 17 feet AGL (5 feet higher than before, about 5 feet over the roof peak. This gives an increase of about 5 dB on the RF 33 signal that's the weakest:
http://www.tvfool.com/?option=com_wr...5b94efb5df18f5
Seems like elevation is worth a lot here. The house is a rambler with a low-pitch roof, hence the low elevation of the antenna.
(I actually wonder a bit about the exact details of the ground-level database in this case. The house actually sits about 6-8 feet higher than the street in front, so the exact elevation of the antenna may not be well resolved anyway.)
Thanks,
Roy