-=> Quoting Scott Christensen to Bruce Clark <=-
 BC> Not to mention, only a few miles of atmosphere to attenuate 
 BC> the signal. 
 SC> Atmosphere is usually a negligable loss factor at less than 1 GHz. 
 SC> What *are* problems are trees, buildings, multiple reflections, very
 SC> heavy precipitation and of course, natural obstructions.
 SC> 
 SC> You can get odd atmospheric conditions where signal ducting will
 SC> happen, but this phenomonon takes energy that is normally radiated off
 SC> the planet and returns it to the planet's surface where it can be
 SC> received at distances greater than normal.
Thanks for the memory jog. 
Guess I was thinking in terms of geosync TV(comm) satellites. 
 
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