[Lowfer] Tree Experience

[jrusgrove at comcast.net]

IIRC, Bill Ashlock was using a 'Tree Antenna' for receiving lowfer stations many years back. Seemed 
like he got decent reception.

Jay




----- Original Message ----- 
From: "JD" <listread at lwca.org>
To: "Discussion of the Lowfer (US, European, &amp;UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Friday, December 27, 2013 3:10 PM
Subject: Re: [Lowfer] Tree Experience


>>>> or is the relatively strong signal from the 50KW station also creating some level of   "ionic" 
>>>> non-linear conductivity process within in the tree(s)---which then a portion thereof is 
>>>> re-radiated or otherwise coupled to the e-probe?
>
> A much simpler explanation may involve the height of the trees.
>
> Although trees are highly resistive "antenna elements" by nature, they are still subject to 
> resonance effects.  Their relatively large diameter and their inherent capacitive loading mean 
> that most any full grown tree can have a substantially different amount of interaction with a 2040 
> kHz EM wave than it does at 1020 kHz.  Not only the height of their trees, but also the spacing, 
> will directly affect the relative levels of carrier versus harmonic at any given point, since they 
> can form a low-efficiency directional array of sorts.
>
> I was able to witness this effect first-hand at an AM station a little over 20 years ago, while 
> trying to show the owners why they needed to deforest (no pun intended) the site to its 
> early-1950s condition if they wanted the same coverage they had back when the station was new.
>
> John
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