A few updates...
I switched the downlead from RG-6 to RG-11 and gained about 1 dB on my worst channel (WFFF). I was surprised at how substantial that RG-11 coax is. I had to bore out the passthrough on the UVSJ enclosure to accommodate. I also switched to a continuous 150-ft length of RG-6 between the bottom of the tree and the house (instead of 100-ft of RG-6 coupled to a 50-ft of RG-59). I was pleasantly surprised to see that gain me about 2 more dB. Finally, I put in the very low noise pre-amp (KT-200, supposedly has only a 0.4 dB noise factor). I believe that gave me about 2dB more over my previous Channel Master CM-7778 pre-amp. So now I’m seeing an SNR of about 23-24 dB at the TV on WFFF. Threshold for reception is about 15 dB, so now I have some good margin. Atmospheric conditions can regularly steal 3-5 dB.
Next steps are to rent the ditch-witch and lay the coax and conduit, complete the grounding, and tidy-up the house-side distribution.
