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Thanks for replying. This all makes sense, but I have some more questions to help me better understand your points.
On the signal strength displays on the HDTV and the converter box, wouldn't I see something other than zero if I were getting too much amplification from the CM7777?
I'd hoped that putting -20dB into the line somewhere with the attenuator would allow me to troubleshoot this issue but it didn't do anything to help, at least when I put it into the input to the amp, and on the line to HDTV after the splitter. I didn't try it between the power injector and the splitter. The CM7778 (for moderate signal areas) has 16 dB of gain instead of 30; I had hoped to simulate this level of amplification (and even less).
What's the difference between a distibution amp and one of these CM7777/7778 preamps? The Channel Master ad copy suggested by GroundUrMast seems to indicate that the preamps could be used to reduce the detrimental effect of splitters.
Yes, the preamp and its power supply is before the splitter.
Taking out the splitter completely and running only one TV only helps a little, with no preamp.
The trees have grown in over 20 years here. I'm not sure cutting down that one oak would help all that much; I think I'd have to get a tower to get over the 70 foot tall trees just 40 feet farther away in the desired direction. My mother-in-law has an unused one, but even though I'm a hardcore do-it-yourselfer, This might not be worth the safety risk, at least not without some very tall bucket truck. Not to mention all the time and effort.
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