The Tv signals at your location are weak to begin with. Splitters reduce signal strength , every split that takes place reduces signal strength. . How many Tv's are connected?? Identify the stations you are not receiving by the stations call signs , such as WDSI-DT 40 FOX. UPN is no longer a network and has not been for some time now. And identify the stations you are receiving by the call signs. Read and understand about , REAL Digital Broadcast Tv Channels , Virtual Digital Broadcast Tv Channels , Analog Broadcast Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695. . Here is how to aim Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html