http://forum.tvfool.com/showthread.php?t=12838 .
Disconnect and Remove All parts of the Winegard AP8700 preamp , remove the preamp unit , remove the power injector , remove the power supply.
Aim the HD7000R antenna at about 311 degree magnetic compass direction.
Can also try , aim the HD7000R antenna at about 18 degree magnetic compass direction.
Here is how to aim the HD7000R antenna and other antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
As always , the starting antenna aim direction is --> the starting antenna aim direction.
The antenna aim direction can be adjusted for best reception.
Most Digital Tv's have a signal strength meter and some Digital Tv's also have a signal quality meter.
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Digital Tv tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do a Double Rescan.
http://www.dtv.gov/rescan.html.
Install the HD7000R antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.
At your location the directions of reception are , north west , north east , east , south east.