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A Helical Loop Antenna for the 20-meters Band
&
Top Load at Vertical Antennas
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A Helical Loop Antenna for the 20-meters Band: By Vladimir Kuz'min, UA9JKW
Two years back I have moved to Nefteyugansk (Russia, Siberia) where I could not receive the sanction to installation for a full-sized HF- antenna on the roof of my house. , So I began to do experimenters with short indoors antennas.
Top Load at Vertical Antennas
All amateurs know if at a vertical antenna a top load it is used, the self -resonance of the vertical antenna would be lower then a vertical without the top load. How a top load does influence to antenna resonance?
PDF file, 230 KB (ANTENTOP-01-2004)
A Helical Loop Antenna for the 20-meters Band
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