The 8700 is a pre-amplifier and mounts at the antenna. The power supply installs in the house and should be placed in front of any splitters. To be clear, there should be nothing between the power supply and the pre-amp.
The best way to ground the antenna is to use a ground block in line with the coax near your electrical service ground for attachment at that point. Protection at the set is a great second line of defense.
I use the Channel Master tri-pod. It is affordable, sturdy, and has a good finish.
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