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Dustyz. Calculations you provided are probably right. I used an online tool to calculate that stuff back when I was looking at using RG11. At my current home which is just south of Cincinnati, the signals are so strong that I don't need it. Even get four Dayton stations with a little 4 bay (U4000 from Antennacraft) and the RCA pre amp.
BTW. Replacing the RCA with a higher gain pre amp may also help. The RCA is a good amp and ideally suited in areas with some stronger signals nearby. But there are other pre amps which offer better gain and a lower noise floor that should help if you are in a real fringe or deep fringe area.
Replacing the entire run of RG6 with RF11 is the best move. You will lose some signal if you have to do a splice or use a connector of some type.
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