Success! 56 miles and 7.6 db of field strength on KLEW RF 22 which, looking at their FCC info, is almost directional with the main thrust of the signal being thrown south into Moscow, ID and Pullman, WA.
From my 32" Samsung internal tuner:
From my Tivax DTV Government Special Tuner patched into my 32" Samsung:
The combiner didn't work. If I combined it things via the 7870, it killed KLEW. No nothing I did fixed it. In the end, I went and picked up another 100' drop of RG6 and now utilize an Antenna switch in house with a dedicated run for each antenna. The 91XG has a 10 db line amp on it before it hits the splitter in the house. I also ordered the RCA mast preamp. However, that may not be needed.
In short, it's working!