Get the antenna up Higher.
I see a white pipe sticking out of the roof , Duck tape a Looooong pipe or put sections of antenna mast together , duck taped to the white pipe.
Is there a chimney on the house?? Can lash a Looooong pipe/mast sections to the chimney for a test of reception.
The reason I recommended the ANT751 is because it is small and as such is not a very directional antenna.
The Tv transmitters are at different locations around the compass.
And the not very directional ANT751 antenna receives to the , front , front angles , back , back angles , to the antenna. The sides of a antenna has the least reception.
The bigger a antenna is the more gain it has in the forward direction and less gain in other directions.
At this point I recommend connect a Antennas Direct CPA-19 preamplifier.
Preamplifiers can help with reception , but are not a substitute for getting signal , getting signal is the antennas job , and antennas receive better with little obstructions or no obstructions in the way of reception.
http://www.solidsignal.com ,
http://www.amazon.com.
Have only 1 Tv connected , no splitters.
Being that I am not there to look at the reception situation when I recommend antennas I do my best to find a balance of directions to receive and signal strengths.
This works out most of the time.
In 98% of my recommendations I go to great lengths to point out the tree situations and obstructions situations as to reception of Tv transmissions.
Because I know that most question askers place little importance to the importance of reception situations.
Your reception situation is not hopeless.
Your reception situation is a chalange.
Also might have to go to a bigger antenna , I am thinking , possibly a Winegard HD7696P antenna.
I am doing my best to strike a balance of antenna size and directions of reception and get all Tv stations with one antenna.