Topband: Toploaded vertical - SWR

[Wes Stewart]

I suspect your data.  For a 0.1 lambda vertical, the radiation resistance will 
be quite low particularly with sloping loading wires and with your radial system 
the ground loss will be high.  Additionally, I think the top loading is 
insufficient to achieve resonance.  Yet you seem to have it.  Your feedpoint Z 
is 15 ohm which seems too low, yet your SWR curve is too broad.  Something just 
looks funny to me, but I've been wrong before.

Wes  N7WS

On 9/18/2018 1:44 PM, Ashraf Chaabane wrote:
> Hi all,
>
> I just finished setting up my vertical antenna for 160 in 3V8SF location. It 
> is 17m (55 ft) long with 2 top loading wires 12m each (40ft), angle to 
> vertical about 40 deg. I added 8 radials, 20m each (65ft).
> With no shunt matching, the SWR at antenna base is 3.2 and at radio side is 
> 2.8. Is there any way I can improve the SWR further?
>
> Photos of the antenna along with SWR curve can be found here: 
> https://drive.google.com/drive/folders/1_3FsWZI3zdi56zz0LOiKNOmfgiWeN6yG?usp=sharing
>
> 73 Ash 3V8SS/KF5EYY
> www.kf5eyy.info
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