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Which of the following can be used to reinforce the upward beam in a marker beacon?

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Which of the following can be used to reinforce the upward beam in a marker beacon?

(a) Reflector

(b) Amplifier

(c) Counterpoise

(d) Vertical polarization

This question was posed to me during an online interview.

The above asked question is from Point Source Radio Systems in chapter Terrestrial Radio Navigation System of Avionics

1 Answer

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Right choice is (c) Counterpoise

For explanation I would say: The marker beacons use an array of half wave radiators that are aligned in line with the airway. A wire mesh counterpoise below this array can be used to reinforce the upward beam by increasing the signal strength in a particular direction.

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