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50' > F81 > 20' > F81 > 6' > 2nd Fl
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4221 > 50ft > 3412 >
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50' > F81 > 60' > F81 > 25' >1st Fl
50 + 20 + 6 = 76 ft
50 + 60 + 25 = 135 ft
difference of 59 ft; about 3 dB for UHF,
approx. the same as a 2-way splitter loss
So if you inserted a 2-way splitter in the 2nd floor line after the 3412, the 2 TVs should be getting about the same signal strength. If not, there is another loss that exists in the 1st Floor line.
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Also, is it possible that the 25 feet of coax cable that I run through the wall on the 1st floor to the TV would degrade the signal if it weren't 75 ohm quad shielded? I read somewhere that this was important. I bought this years ago, and I'm not sure if it is 75 ohm quad shielded or not.
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The attenuation loss is about the same for regular coax as it is for quad. The quad has an extra layer of shield to reduce pickup of interference; you don't need it for most applications.
Do you have AC power for the 3412 in the attic?
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Vizio M552I-B2 (1st floor TV)
LG 42LD550 (2nd floor TV)
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LG 42LD550
http://www.lg.com/us/support-product/lg-42LD550
When selecting DTV or Cable DTV input signal in Manual Tuning, you can view the on-screen signal strength monitor to see the quality of the signal being received.
I'm having trouble downloading your Google doc of channels. I think I would need to log on before it would allow my me to download it; I have had this trouble before.