Install the ANT751 antenna above the roof in such a manner that your roof and house are not blocking reception all directions.
Aim the ANT751 at about 286 degree magnetic compass direction.
Try and locate the antenna so the house next door is not blocking reception to South Mountain.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Yes use the coax that goes from the attic to the structured wiring cabinet.
The Digital Tv transmissions are Strong signal strength at your location , no amplifier is required.
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Amplifiers Do Not -pull- signal through coax , amplifiers do not -pull- signal from antennas.
Amplifiers Do Not work like a vacuum cleaner motor.
And the metal reception elements of a antenna Do Not work like a vacuum cleaner hose.
Antennas Do Not pull in signals.
Antennas receive the signals that arrive at the metal reception elements of the antenna.
The amplifier , amplifies the signal that it starts with at the input of the amplifier.
Splitters and long lengths of coax reduce signal strength.
If there is less signal to start with then less signal will be amplified.
The best place for a amplifier is closer to the antenna where the signal is the strongest.
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---->Your location has Strong signal strength , a amplifier is not required.<----