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Old 01-14-2010, 12:19 PM
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kb2vxa kb2vxa is offline
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Relaying this information from reliable engineering sources the rule of thumb is one mile per watt effective radiated power direct line of sight on VHF FM. Of course there are plenty of other factors to consider like frequency (directly related to atmospheric absorption), mode, etc. which tend to complicate things but why dwell on it? Why not answer a simple question with a simple answer and leave the complications to the physics professors?

Now if you want a constant in the realm of physics, EM radiation in free space like gravity diminishes by half at the square of the distance. Ground control to Major Tom...
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