Originally Posted by Calaveras
I used Google Earth and the WFAA transmitter tower to find where 42 degrees at 23.8 miles is. I found your lake, the hill and your approximate location. Using Google Earth elevation numbers you are at 468' (10' above the lake) and the highest point on the hill is 545'. The hill is 77' higher than you are. The apparent angle of the hill is 0.25 degrees at 3.4 miles from you.
The WFAA antenna is 1841' higher than you but at 23.8 miles it has an apparent drop in elevation of 378' due to the curvature of the Earth. (There's a formula for this.) So the antenna height is equivalent to 1463 feet higher than you over a flat surface. From your location that's an elevation of 0.67 degrees.
WFAA is indeed LOS to your location as I assume the other stations are too. If your trees weren't there you'd be able to see the top of the tower with a telescope.
Any of those 100' trees on your property? If so, hire a tree trimmer to climb the tree, cut a few branches off near the top and end mount a small VHF/UHF antenna. No preamp or rotor required. Problem solved!
Thanks Calaveras, your figures almost match my "eye" guess work. I do think the hill is a lot closer and it sure looks a lot taller. When I attempted the Google street view, it looks like those pictures are about 1-2 years old. One of the "glass" 3 story houses on top of the hill is under construction. There is a large 2 story "metal" house (all sheet metal - super modern wild thing) about a 100 feet from that glass house that is now under construction that Google does not show.
I am almost certain the hill is less than one mile from the house, so I will measure it with the car. I am referring to the base of the hill. Going from the base of the hill to the top is about 1/10 mile. The ground does go downhill from the house to the base of the hill, so perhaps my brain did not calculate for that.
Unfortunately, the trees are not on my property. Also that last group of tree trimmers used by the owners were "afraid" to go above 50' in the trees, pretty much useless. Also, the last 30' of the limbs will not support the weight of a man. The company they used were not professionals and did not have the equipment to do the job. The owner of the property will not make further adjustments. All the remaining trees are on City of Dallas property between here and the lake; they have like rules or something.
Since this is all experimental and the current HD7694p with pre amp is coming "off" the roof; I may be able to do some more experiments with and without the preamp. May try the pre amp on the current inside antenna, may try the smaller antenna in the attic, with and without preamp. It would a lot easier to get into the attic and I could determine what effect the aluminum foil heat barrier has on the antenna.
I still think that "if" there is a solution to this it will be the HD7697p on the roof at a different position than the current antenna. The width of the chimney will allow for adjustment of about 32" in width (left to right), and the height could be lowered by up to 36" as long as it does not interfere with the chimney cap.
Side note: This house has a two foot wide aluminum soffit the full perimeter of the house. The current inside HD7697p currently is aimed through that aluminum as best as I can tell. Perhaps the aluminum heat barrier would be no worse than that?