Why do you revolve the wires on your unun?

Why do you revolve the wires on your unun?

EFHW match box, end fed half wave transformer, 49:1 unun and impedance transformer – the animal goes by many names. Try to Google one of them, and you will find many examples of home brew variations of them. They all seem very like (because they are) and nearly all of them share a common feature: Revolved windings. Why do people over complicate this simple device?

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