Ok , because you know that you have a patch panel and you used the word , Demarc , a short version of the word Demarcation.
I am hoping you have some understanding of what is going on here.
I will do something I almost never do when helping people with words and pictures only.
If required to get reliable reception of channel 5 through the distribution system.
Install a second amplifier , yes I know , I said it.
A VHF only preamplifier , Winegard AP3700.
http://www.warrenelectronics.com/antennas/AP3700.htm.
With the HD7084P antenna at 30 feet that makes 14.4 NM(dB) for channel 5 and a antenna gain 7.4 NM (dB) at channel 5 , that makes 21.8 NM(dB) a respectable number.
So try reception with out the VHF only preamp first.