Which direction did you pick for the 4221, 260 or 115?
Where is the 3412 located, near the antenna or further downstream?
Tell us how long the cable runs are starting at the antenna, then down to the splitter or 3412, then to each TV. Is it like this?
Code:
coax 20 ft > 2nd floor TV
/
4221 > coax 50 ft > 3412 >
\
coax 60 ft > 1st floor TV
Give us a list of channels at each TV; it does sound like the 3412 made an improvement.
Quote:
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Is it possible that some of the cabling being used on the downstairs route is not up to snuff?
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Yes. It is also possible that there is a hidden splitter or defect on that run. You can check that by running a temporary length of known good coax downstairs.
Do you have any way to measure the signal strength with one of your TVs?