I suggest a CM7778 preamp installed close to the antenna. The stations to the east/north east are weak and FOX 13 is being received on the back side of the antenna reducing the signal. The splitter reduces the signal to the point that digital lock is lost. The preamp needs to be installed close to the antenna , like directly below the antenna. . As always , look in the connectors on the ends of the coax , if outer shied and shield wires of coax are pushed in toward the center wire then push away from center wire. Look and see if foam is on the center wire , if so then scrape it off , foam is a insulator. . Read and understand this about , Real Digital Tv Channels , Virtual Digital Tv Channels , Analog Tv Channels , ,
http://forum.tvfool.com/showthread.php?t=695