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Since you have a pre-amp, the cable losses don't really matter any more. Your pre-amp has enough gain so that it should more than make up for the losses I'd expect to see with about 80 feet of cable.
At worst, I'd expect 80 feet of RG6 cable to drop the signal by around 6 dB on upper UHF channels. Your pre-amp's 19 dB of gain is more than adequate to deal with that.
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