Coils on antennas

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Thatsclear

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Why do some antennas have coils on them and some do not? What does this do? I can't find anything explaining it. Thanks.
 
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Why do some antennas have coils on them
Coils, or "Loads" electronically alter the length of the antenna.

Read here:


 

Ubbe

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It could also be an impedance match that connects one part of the antenna, that might be of a 3/4 wavelenght, to a 1/4 wave part. It could also be a phase shift coil to make different antenna parts work together in phase and add gain.

/Ubbe
 

n5ims

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They're also used to pass some frequencies and block others to form a multi-band antenna.
 
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