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Parameters for helix HF antenna at 12 Mhz

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105s

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Anybody design helix HF antenna? i want to design a helix antenna which work for 12Mhz?how to define its parameter?thanks.
 

Re: helix HF antenna

I am not shure the frequency is correct, but for 12MHz, 10dB gain you will have dimensions length=57 feet and diameter 26 feet for 3 turns. I think such antenna would be impractical.
 

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