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For perspective on this topic: in his textbook ANTENNAS For All Applications, 3rd Edition (McGraw-Hill), John Kraus shows in the text surrounding his Figure 8-72 that a conductor wound in the form of a normal-mode helix has very nearly the same performance characteristics as a linear conductor having the same, overall, end-end length as the helix. However ...


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I would guess that slightly-helical dipole elements wouldn't give you enough inductance to compensate for the capacitance of your shortened dipole, so in effect you would have a shortened dipole. Since it would only be slightly shortened, this wouldn't be the end of the world, but you would probably need a transmatch (antenna tuner) to keep the transmitter ...


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