Which frequency range is identified as the HF band in some descriptions?

• A. 3 - 30 MHz
• B. 1 - 10 MHz
• C. 2 - 29.999 MHz
• D. 4 - 40 MHz

Answer: (C)

HF refers to the range used for long-distance shortwave communication, and with band definitions there isn’t a single universal boundary. In many sources, the HF range is given as 2 MHz up to 29.999 MHz, reflecting older or alternative classifications where the lower limit is set at 2 MHz and the upper limit just under 30 MHz. This is why that option is identified as the HF band in some descriptions. The more widely cited standard today is 3–30 MHz, but older texts and certain manuals still use 2–29.999 MHz. The other ranges either sit lower into LF/MF or push into VHF, so they don’t match the HF scope in those descriptions.