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F MHz Fresh water Salt water
0.01 3.9 dB
0.1 12
1 39
10 121
100 ~ 50 dB 369

Roy Lewallen, W7EL

Roy Lewallen wrote:
. . .
Here are a few numbers for attenuation per meter. It's hard to find good
data on loss in real fresh water, but I did locate a representative
number for one frequency.

F MHz Fresh water Salt water
0.01 3.9 dB
0.1 12
1 39
10 121
100 ~ 50 dB 369