How can I determine how many turns a helical antenna should have?

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Malcolm White

http://astro.abhinav.ac.in/Literature/Antennae/Kraus_Helix_Idea.pdf

Krunal Patel

If the dimensions of the helix antenna are very smaller than a wavelength then the radiation will be normal to the axis of the helix and if the circumference approaches a wavelength then the radiation will be along the axis of the helix antenna. Accordingly, you can determine the overall length of the antenna.