[TowerTalk] Change in Frequency As Antenna Height Rises

[jimlux]

On 6/3/16 4:18 AM, Steve Hunt wrote:
> Plus, EZNEC assumes homogenous ground to infinite depth whereas I have
> this:
> http://www.karinya.net/bungalow/preparation/prep2.jpg
>
> Steve G3TXQ
>
>

Indeed..

Although I've not modeled it, I would think that it's the top layer of 
soil that really affects things.

Skin depth at 7m is about a meter or two (for 5mS-m conductivity) - 
that's like 1.5-3 dB/meter loss.

So any "reflection" from the interface between layers is attenuated 
substantially (and the reflection is unlikely to be 100%, anyway)

And, if you have sufficient rain/water/salt marsh to get your 
conductivity up in to the 50mS/m range, skin depth is a foot.