It is very hard to calculate this as you have to compare "apples with apples". A calculation by PA3FWM suggests this could be 17dB!!
See http://www.pa3fwm.nl/technotes/tn09b.html .
20 Nov 2017
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8m FT8 RX (Sunday)
My gear is on 8m (40.680) FT8 RX. I know activity is way down on 6m. UPDATE 1711z: No spots. I suspect people are on 6m, 4m and 2m Es.
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