A Simple reception situation.
The Digital Tv stations/channels are Strong Signal Strength at Your Location.
Install the ANT751 antenna , -->Up High<-->Above the Peak of the Roof in such a manner that reception is not blocked by the roof and house in the directions of , north east , north , north west , west.
Aim the ANT751 antenna at about 330 degree magnetic compass direction. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
As a Test to Prove Reception.
Install a New matching transformer (balun) that connects the antenna to the coax.
Run a loooong length of New Coax from the matching transformer , through a open door or window , Direct to the Tv.
No coax ground block coupler , No splitters , No couplers , No amplifier , No nothing.
Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with a simple channel scan.
Double Rescan.
http://www.dtv.gov/rescan.html.
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As always trees and tree leaves do a good job of , multipath/reflecting , absorbing , blocking , Digital Broadcast Tv reception and so do buildings and other obstructions in cluding your own roof and house.
Install the antenna Away From Trees not up close to trees in the directions of reception.
It is best to install the ANT751 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.