>>You can do 30 miles LOS if you are high enough at each end and there
>>are no high spots too close to the ends. Fresnel zones that occur if
>>you don't meet the preceding requirememnts kill your link quite well
>>in most cases.

> There are a few small bumps that nearly
> block the path, so tree attenuation will be an issue possibly.

If your program can deal with Fresnel zones that's fine.
If not then intermediate points that  " ... nearly block the path ..." 
need to be analysed for Fresnel Zone problems - this can make  a path 
unusable even without trees etc.

Basically the issue is mulipath signals which interfere in an 
undesirable manner. Murphy is expert at doing this.



        Russell

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