Replace the matching transformer (balun) with a new matching transformer.
Connect a known to be good new long length of coax straight to the Tv through a open door or window.
No slitters , no couples , no amplifiers , no nothing.
Tv antenna -> matching transformer -> coax -> Tv.
Aim the antenna at about 62 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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Also please make a second tvfool radar report with the antenna height at 15 feet , to see what signal strength does.
Do not change the first tvfool report.