Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies.
In this version the 20m wire is in the middle. So the order is:
My third fan-dipole will be a more robust antenna than the previous more experimental ones. So therefore ... I will give up some higher bands (10m / 6m).
And, the 160m band must be included... (for many decades the lowest radio frequency band allocated for use by amateur radio)
Main goal is to end up with a fan of resonant dipole antennas on all the included bands.
My garden is to small for full-size 80m and 160m band dipoles, so I had to shorten and or fold (and even combine) some dipoles.
(local message -Dutch only)
Net (2018-01-08) een 2m/70cm combi antenne (EANTENNA EA270ZB13 5+8 EL. 144 MHZ./432 MHZ) gewonnen, haha, ja gewonnen ;-)
Verloot door Hans Dijkerman van https://www.communicationworld.nl vanwege het 1200 lid in de Facebook groep "Radiozendamateurs nieuws & updates".
Leuke start van het nieuwe jaar!!
As the 30m band is CW-only, I will skip this band for the moment. I'm not (yet) a CW guy.
Leaving 17m an 12m to combine in one antenna.
How to make the antenna resonant for both bands. The frequencies relate to each other as 3 to 4.
On the Internet there's lot of discussion about this End Fed.
One thread uses a full wave for 12m a coil and after that a wire of less than a meter to make 17m and 30m resonant. But how dus this work in theory?
So I dicide to start with one band: 17m.
Most fan dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies. Each configuration is measured (SWR / impedance / Smith diagram). Results presented on the following pages.
This is the second version of the fan dipole.
Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies.
In this second version the 6m and 10m wires are swapped. So the order is now:
This is the first attempt for the fan dipole.
Measurements (SWR, impedance) after quick tuning of dipole wires to give a first impression. Not all dips on frequencies where I want them to be...
Most Fan Dipoles have a low to high band wire order (top-down). This might be the best solution, but I experimented changing the order. Putting higher frequencies between lower frequencies. Results shown below have this order:
The Fan dipole for 40/20/6m performs well. Now it's time to extend the Fan with more bands.
I want to add dipoles for 80m, 15m and 10m. Making it a resonant antenna for all bands from 80m to 6m (except WARC bands).
Adding more parallel dipoles will make the angle at the centre sharper for some the bands (the lower wires). This will affect the radiation pattern. It also decreases the impedance for those bands.
I like to understand things... 
Why does an antenna radiate? What is a electro-magnetic field? What makes a antenna resonant?
On the Internet there are a lot of good sites which explain the basic principles and theory of antennas. No need to repeat it here.
Therefore a list of sites I discovered:
For me, creating and optimising antennas is an inspirational part of the hobby. An antenna analyser is a good tool to get the electrical part right.
Measuring the radiation pattern of an antenna is not that easy. So ... practice comes in.
On HF conditions can quickly change.
So to compare you need instant antenna switching.
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