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Which of the following type is not used in an Omega system?

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Which of the following type is not used in an Omega system?

(a) Grounded tower

(b) Insulated tower

(c) Hanging tower

(d) Valley span

I got this question in an online interview.

My question is based upon Hyperbolic Radio Systems topic in section Terrestrial Radio Navigation System of Avionics

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The correct option is (c) Hanging tower

The best I can explain: Since the Omega stations transmit in very low frequencies, the antennas are the largest physical structures in the stations. Three types of antennas are employed in the Omega system: grounded tower, insulated tower, and the valley span.

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