Perseverance pays off!
I remembered I took their 605 from the Kitchen, and plugged it into the single continuous RG6 Cable, and as their 605 worked perfectly back at the Multiswitch, there wasn't anything to be gained by trying our 605 there as well. I knew the signal was great (mostly) after the multiswitch, but dying after the ~300 feet to their receivers. So logic dictates something is wrong with the cables /connections /etc. My neighbor had a part box (a little over 550 feet) of RG6 that's been kept warm and dry in his basement workshop since the original install. So to compare it to the best cable he has connected (the single continuous RG6 Cable) in case it had degraded over time, we unspooled it, and cut a piece the same length. I put my AquaTight F connectors on each end, plugged one into the new multiswitch output, and the other to my 605 inside the Cabin. The signals did improve marginally, but I still did not get the desired channels the neighbor wants.
Even though the old Quad LNB / Phillips Multiswitch worked for years on this cable run, the combination of the new Xku LNB / Steren (or Phillips) Multiswitch just didn't have the "Oomph" to overcome the line losses. So in one last gasp I installed a Phillips SDW5005GN In Line Amplifier on the test line, just after the new Multiswitch.
Then all of the missing channels came in.
Even the notorious AMC Channel 130 /630 came in. It's signal strength was 87 and the EcbNo was 5.8. And it was the poorest of the lot. The Neighbor was amazed, and I was very relieved. I decided to connect the output of Phillips SDW5005GN to one of the Cables heading to the Neighbors house. We picked the poorest one with splices, indoor cable, and a screw on F connector - it connects to their 605 from the Kitchen. Although there was some degradation, the notorious AMC Channel still came in along with all the music channels, and everything else. The Neighbor's Wife was grinning ear to ear.
Of course now the problem is I had only one Phillips SDW5005GN with me in my bag of Cable /Sat tools and supplies. I was certain I had bought 4 (from Princess Auto) and I left 3 for the neighbor to try when we were first trying to make the system work. He swears I didn't, but looked around anyway and couldn't find them. (I think I posted about that earlier in this thread. I'll go back and check.)
So I called every store I could think of in Kamloops for an In Line Satellite Amplifier but nothing. I even checked the web but no joy with those folks either.
I had to leave and return to Vancouver. (Meetings downtown tomorrow.) I'd prefer to buy something from a retail store but we may have to go to the web. There are lots of in line amplifiers there, and on eBay.
In the meantime, the Neighbor's wife has laid claim to the one and only Phillips SDW5005GN that feeds her TV.