Google "RF Exposure calculator" and you will get the University of TX
Amateur Radio Club's on line easy fill in the blank calculator for any RF
exposure.
Plugging in typical values for 500 watts, and assuming various gains for the
antenna shows a dipole equivalent rain gutter would not be in compliance for
either controlled or uncontrolled exposure. You would have to keep people a
28 feet from the gutter to avoid too much RF exposure. Now, the problem is
greater at high frequency, and that case was run for 10m.
But, it points up the risk of having something like a vertical downspout
that is usually not protected from humans, being your antenna, at any medium
power.
-Stuart
K5KVH
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