On 12/27/2011 2:22 PM, Jim Lux wrote:
> <snip>
>
> There's a difference between H and V pol as one might expect (thinking
> of trees as lossy conductors).
> Lower frequencies are more affected by wood, not leaves.
> Rain/humidity/water has an effect (more wet = more loss)
> Single trees have an attenuation around 5-20 dB at UHF (860 MHz) CP
Don't forget the conductivity of deciduous trees changes dramatically
from winter to spring. It's *probably* highest in early spring than it
is in summer for HF and the sap flow is highest in early spring and the
content is different. However I can only speak for the trees that grow
around here in the frozen North.
73
Roger (K8RI)
>
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