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[TowerTalk] Half slopers using a tower

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Subject: [TowerTalk] Half slopers using a tower
From: (
Date: Wed, 2 Jan 2002 07:47:17 -0600
On Tue, 1 Jan 2002  hasan schiers <> writes:
> I've used the w9inn 160/80/40 sloper on a 72' tower with hf antennas 
> above as  a capacitive top load. On 160 the vast majority of the
> was  in the  tower. On 80, the tower still dominated, on 40 the wire
> started to  share the current distribution more equally.

        Interesting observation Hasan.  Another SIMPLE
        solution is my elevated GP trick, placing insulated
        1/4 WL radials at 10 to 15 ft above ground, just like
        a sloper, but horizontal and low on the tower.  The
        length of the radials can be adjusted for resonance.

        It helps to have an antenna analyzer, preferably one
        that will show both resistance and reactance, for
        tuning / matching.  SEVERAL people have told me
        they have used this technique successfully with 
        as few as two radials.  Of course more is better.

        I insulate the radials with nylon cord loops and
        connect the wires directly to the center conductor
        of the feedline.   Tom  N4KG

> I would model your situation wit EZnec and see what is 
> really going  on. 

        There's nothing like a good model !   N4KG
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