Discussion
What is the purpose of a balun at the feed point of a dipole?
Answer: A
A dipole is balanced while coaxial cable is not, so without a balun current flows on the outside of the coaxial braid, which radiates, distorts the pattern and makes the measured impedance depend on the feeder length. Some baluns also transform impedance, a four to one type for instance, but that is an additional function rather than the definition. Lightning protection and polarisation are unrelated. Feeder radiation is one of the commonest causes of a pattern that does not match prediction.
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