Re. amplifiers, I offered suggestions in your thread,
Help with Antenna Selection - SW Michigan. Other members are certainly welcome to offer alternate suggestions.
The best location for an amplifier is at the antenna, provided the signal levels there are not so high that they will cause the amplifier to overload. Your reception report shows moderate signal levels to I'll stick with my previous suggestions. The least effective location for an amplifier is at the TV.
I also offered aiming suggestions in your previous thread, though they were based on a two antenna solution. The high gain, narrow beam-width of the HD7084P may make finding a single aim point difficult. With the single all channel antenna, you'll not have the ability to fine tune aim to the extent that you would with a two antenna system.