[TowerTalk] Tree attenuation

Jim Brown jim at audiosystemsgroup.com
Mon Nov 7 16:24:28 EST 2005

On Mon, 07 Nov 2005 12:15:59 -0800, Jim Lux wrote:

>As far as HF goes, it gets quite a bit more complicated(!), for two reasons:

>1) The forest scale (height of trees, etc.) is on the same order as the 
>wavelength  (at VHF, trees are MUCH bigger than a wavelength, and leaves 
>are MUCH smaller).

>2) Most practical applications of a model have the antenna in the forest, 
>where the forest is in the near field of the antenna.

I skimmed both the Power Point and the longer document.  The analysis that went 
into the Power Point make it considerably more valuable in guestimating what 
might happen at VHF and low UHF,  but neither gives much insight into HF. 

The obvious question is, is anyone aware of anything equally good for the HF 
spectrum?  My future antenna supports are likely to be redwoods, 25-30 meters 

Jim Brown K9YC

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