Which option correctly lists uses of HF communications?

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Multiple Choice

Which option correctly lists uses of HF communications?

Explanation:
High-frequency radio waves travel by reflecting off the ionosphere, letting a transmitter reach receivers far beyond line of sight without relying on satellites. That capability makes HF ideal for long-range links such as between aircraft and ground stations, between ships at sea, and between ships and shore facilities. It can also reach submarines when they are on the surface or near the surface, since the waves can propagate to the antenna up above the water. In contrast, satellite-based communications use different bands and paths, and underwater acoustics use sound in water rather than radio waves, so those are not typical HF uses.

High-frequency radio waves travel by reflecting off the ionosphere, letting a transmitter reach receivers far beyond line of sight without relying on satellites. That capability makes HF ideal for long-range links such as between aircraft and ground stations, between ships at sea, and between ships and shore facilities. It can also reach submarines when they are on the surface or near the surface, since the waves can propagate to the antenna up above the water. In contrast, satellite-based communications use different bands and paths, and underwater acoustics use sound in water rather than radio waves, so those are not typical HF uses.

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