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Actually Jackson's graph (Fig 7.9 p291 op cit) shows a steeply climbing
absorption coefficient for seawater to 100 MHz - John assumes (not
unreasonably) that this continues through 840 MHz.
Given this assumption, seawater would absorb ten times more with distance
than fresh water giving an attenuation length of 1 cm for saline
vs 10 cm for fresh water at the cellular frequencies.