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Before cutting the cord for your entertainment programming, it's necessary to ask how you will be getting your broadband internet service. If you will be getting it still from your cableco, be advised that you CANNOT put the antenna signals on the same physical coax runs that your cable internet service is distributed on. You would, in this case, have to run separate coax for each system. If you're moving to DSL or one of the other internet services, this is not a problem since they would be relying on the coaxial cable in your home.
Playing with small increments in receiving antenna height within TVFool's modeling engine is generally a waste of time since the engine uses terrain averaging in 100 m (330') blocks. Small changes in one variable cannot be considered to be precise when another variable has such a large potential variance from the true terrain profile. That said, it is an excellent suggestion to keep all height options open as you hunt for a good signal when in a valley. I've had folks call me back and relate how they pulled the antenna off a 30' mast and stuck it under a deck and have gotten improved reception. Just keep in mind the the amount of signal diffraction is going to vary greatly depending on the frequency of the signal and the distance to the diffracting obstacle.
For your location, you will be best served with two antennas: A deep fringe Yagi with a tiltable mount pointed due east (+4 ° magnetic) plus a medium range high-VHF antenna aimed at 115° magnetic. You can select either a dual-input preamp or a single input preamp with a UVSJ. Both work equally well. Boresight the UHF Yagi to your visual horizon for best results.
Good luck on your project!
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