Joe Nicholson writes in a message to Scott Huffman
 SH> (2) Why do high frequency RF signals attenuate more rapidly than
 SH> low frequency RF signals.
 JN>   (...) (stupid stuff omitted) 
 JN>  Or, we could get into a physics discussion over the reflective 
 JN> and  absorption properties of the atmosphere (troposphere and 
 JN> strarosphere  and other layers) and how RF signals behave in 
 JN> each of those layers. 
Scott is asking about the free space, line of sight loss, which has nothing 
to do with environmental factors and everything to do with distance and 
frequency.
  
The factors that you mention are important, especially below 30 MHz, but not 
part of this discussion.
 
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