VT-IV Navigation Familiarization Exam II Practice

What is the HF frequency range?

3 MHz - 30 MHz 2 - 29.999 MHz 4 - 40 MHz 1 - 20 MHz

Correct Answer:

3 MHz - 30 MHz

Explanation:

HF spans from about 3 to 30 MHz. This range is defined because frequencies in this band can reflect off the ionosphere, allowing long-distance, beyond‑line‑of‑sight communication. Frequencies below 3 MHz sit in the MF region and don’t offer the same reliable ionospheric skip, while frequencies above 30 MHz move into the VHF range where long-range reflection isn’t practical. So 3–30 MHz is the standard HF range. The other options either start too low (including MF) or extend beyond 30 MHz into VHF, or mix in values outside the HF band.

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