Is the antenna mounted above the roof in such a manner that the roof is not restricting or blocking reception??
As always , trees and tree leaves do a real fine job of , reducing , reflecting , blocking , Tv reception and so do buildings and other obstructions.
It is best to install the CM2020 at a location that has least amount or no amount of obstructions of any type or kind of the directions of reception.
At your location that is , north , north east , south east.
Aim the CM2020 at about 85 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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The Tv transmissions a Very Strong at your location.
The following is Test of reception.
Remove ALL parts of the preamplifier , the outside preamp , the inside power supply and power injector.
Install a New matching transformer (balun) to the antenna.
Connect New a Coax to the matching transformer and run the New Coax through a open door or window , ->direct to the Tv<- , no splitters , no couplers , no nothing.
Antenna -> matching transformer -> coax -> Tv.
Scan for the digital broadcast Tv stations channels.
What is reception like Now??