A Marconi antenna, used by most AM radio stations, consists of the top half of a

Question

A Marconi antenna, used by most AM radio stations, consists of the top half of a Hertz antenna (also known as a half-wave antenna because its length is ?/2). The lower end of this Marconi (quarter-wave) antenna is connected to Earth ground, and the ground itself serves as the missing lower half. Please Full, Complete, and clean answers for rating. Thanks!

(a) What is the height of the Marconi antennas for radio stations broadcasting at 519 kHz.

(b) What is the height of the Marconi antennas for radio stations broadcasting at 1 530 kHz.

Explanation / Answer

For this frequency , and indeed for the most of the AM broadcast band full sized antennas are too large and costly to construct.
So instead they use reduced height antennas.

This height will depend upon many things, such as zoning restrictions, proximity to airports , and the desired coverage area.

To compensate for the reduced height (which changes the resonant frequency) the antenna will either have top loading via a capacity hat ,,, or base loading with an inductor at the base.

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