WCSH-DT REAL UHF channel 44 , virtual number (6.1) NBC.
And
WGME-DT REAL UHF channel 35 , virtual number (13.1) CBS.
Are both more toward the north west , it is Ok to turn the ANT751 antenna more toward the north west.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Tv antenna aiming is not 100% plug and play.
Many reception situations require adjustment of the the aim and location of the antenna for best reception.
This is normal , it is the way it is.
I recommend aim the ANT751 more toward the north west.
And do a double channel rescan.
Digital Tv tuners can develop , Digital Glitches , that are not cleared out with a simple channel scan.
http://www.fcc.gov/rescan.html.
Adjust the antenna aim for strongest reception of , NBC and CBS.
Most Digital Tv's have a built in signal strength meter , and some digital Tv's also have a built in signal quality meter.
Also the ANT751 needs to be at a location that has the least amount to no amount obstructions of any type or kind in the directions of reception including your own house.
The directions of reception at your location are , north east , north , north west , south west , south.
Trees and tree leaves do a real fine job of reducing and blocking Tv reception and so do buildings and other obstructions.
All coax and couplers and grounding blocks and matching transformer (balun) are suspect of being bad.
As a test , I recommend install a new matching transformer (balun) to the ANT751 antenna and run a new Loooong coax from the matching transformer directly to the Tv.
This is all a normal process of finding possible problems of the antenna system.
Tv antenna set up and reception is not 100% plug and play.
A preamplifier may need to be installed for your reception situation , a Antennas Direct CAP-19 preamp.
However a preamp is not a substitute for fixing antenna aim and possible problems with the antenna system.
Driving a car is not 100% plug and play.
Shopping is not 100% plug and play.
Raising kids is not 100% plug and play.
Tv's are not 100% plug and play.