Vitaliy wrote:

>> Your 100mW may still be overshadowed by a transmitter a mile away
>> pumping out 5W....
> 
> Wow, you are right! I should have done my homework... this goes against my 
> intuition:
> 
> 100 mW / (10 m)^2 = 1 mW/m^2
> 5000 mW / (1609 m)^2 = 1.9 mW/m^2

Maybe your intuition wasn't that wrong, after all... Probably when you
divided 5000 by 2588881 (that's 1609^2), you took the 10^-3 of the result
as meaning "milli", but with milli already going in, it's "micro":

 5000 mW / (1609 m)^2 = 1.9 uW/m^2

Gerhard

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