The signal strengths are strong at your Tv location.
Above the peak of the roof install a Channel Master CM5016 antenna aimed at about 353 degree magnetic compass direction.
Here is how to aim antennas ,
www.kyes.com/antenna/pointing/pointing.html
Use a Real and Actual magnetic compass to aim antenna.
----------
To prove reception , connect a New continues length of RG-6 coax with the Compression type connectors on the ends of the coax , not the old crimp type connectors on the ends of the coax , to the antenna.
Run the New continues length of coax through a open window or door direct to 1 Tv.
No amplifier , No splitters, No couplers , No etc. .
Digital broadcast Tv tuners can develop -Digital Glitches - that are not cleared out with simple channel scans.
Do a Double Rescan ,
www.wchstv.com/DoubleReScanAlert.pdf
-----------
What is reception like now??
--------
Here are places to buy antennas and etc. .
www.solidsignal.com
www.amazon.com
www.channelmasterstore.com
-------------