Schematic:
For the 40, 20, 15 and 10 meter band, I have shortened the first part of the antenne from 20.40 meters to 20.15 meters.
I have also decreased the coil value from 120 to 90 uH in combination with a longer extension of the 80 meters part at the end, this gives a better bandwidth on 80 meters.
Measuring results:
80 meters 40 meters
20 meters 15 meters
10 meters Minimum SWR
SWR curve 80 meters
SWR curve 40 meters
SWR curve 20 meters
SWR curve 15 meters
SWR curve 10 meters
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