IMPORTANT QUESTION: When aiming at WLIW, real CH-21, are there buildings, air conditioners or trees in the path?
From what you have shown us, I'm confident your HDHR is a valuable diagnostic tool, which you know how to use. I'm not as inclined to ask you to use another tuner to test. I have yet to find a better signal meter in a consumer grade TV, STB or competing network attached tuner.
IMPORTANT POINT: To focus on Teleview's question, only one balun (matching transformer) should be connected to the antenna terminals. Connecting multiple baluns to the antenna will result in severe impedance mismatch and signal reflections in the coax, all of which reduce signal strength and quality.
To feed three separate households you should use a
balanced 3-way splitter if the cable runs are roughly equal in length. If one of the cable runs is significantly longer, use a
typical 3-way splitter which has low loss on one of the three ports, which would be used to feed the longest coax run. If you're not sure which splitter type is best, tell us how long the coax runs are, and, how many TV's are in each household (ooops, I see you've already indicated 1 TV per household... Thanks).
The many strong signals present, argue against using an amplifier. But each household may opt to use a DA (distribution amplifier) if adding many sets.