My 2 cents,
I would keep the mast above the rotor at 2 feet or less to help extend the life of the rotor with such a large antenna. This should also help keep the rotor synchronized longer since the load on the motor will be considerably less.
As far as the pre-amp, I prefer mounting below the rotor for ease of service/installation. I haven't noticed a difference between 5 or even 10 feet of cable in extreme fringe areas, even on the highest UHF channels.
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