A Vertical Antenna for SOTA (a work in progress)

I have often thought of adding a vertical antenna to my SOTA kit for DX use.

This interest was re-kindled when I spotted this kit from Qrp Guys.

The kit also generated discussion on the SOTA Reflector here.

After some thought I settle on a vertical that would cover 15, 17 and 20m with 30m as a maybe.


Base of Antenna

I settle on the following design options, A trapped end feed half wave, Individual J poles, or A trapped quarter wave

I liked the idea of the endfed as the counterpoise is not as complex as radials. But the final design was dictated by squid poles, I have two “small” squid poles, one of around 4.5m and the other around 5.5m. When testing with the longer pole I discover its make up was effecting the tuning of the antenna whereas the shorter pole was not.


Inside of base unit


So.. the design is a Trapped Quarter vertical for 15, 17, and 20m. The pole is a bit short for the 20m section, but by supporting the antenna at the 17m trap there is little weight on the top  two sections with the last metre of wire. I have included a loading coil in the base for 30m operation.


Supported Antenna at vk3/ve-203

The antenna works fine on 15, 17 and 20 but on 30m I noticed a change in vswr as I removed my hand away from the antenna analyser, thus suggesting the 10 foot radials are too short for 30m, more work to be done.

One thought on “A Vertical Antenna for SOTA (a work in progress)

  1. Pingback: A Vertical Antenna for SOTA (a project I am still working on) | vk3byd

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