The DXZone.com Amateur Radio Internet Guide

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Build your own HF balun

Posted:
https://www.dxzone.com/dx34173/build...hf-balun-.html

Antennas/Baluns
A balun is a MUST for dipoles or similar antennas when they are feed with
coaxial cable. From the RF point of view, the shield can be modeled as two
conductors, the internal shield (the real shield, this is, ground) and the
external shield, who is really far to be ground. In this way, your dipole
has 3 arms, the two from the dipole and the coaxial cable shield (external
face)