>=+
You are having many troubles with your installation.
A UVSJ = UHF antenna / VHF antenna , Separator / Joiner can be used to combine the the DB8e UHF/Y10-7-13 antenna.
A reversed splitter Will Not provide good results.
www.hollandelectronics.com , sells UVSJ .
And radio shack also sells UVSJ .
Do not allow the people at radio shack to tell you a reversed splitter is the same thing.
And as the the RCA preamp.
I recommend install a ,
www.antennacraft.net , 10G221 preamp on place of the RCA preamp.