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T3B10
What frequency range is referred to as HF?
Pick an answer to check it.
Answer: C. 3 to 30 MHz
HF (High Frequency) covers 3 MHz to 30 MHz. This is where most long-distance ionospheric contacts happen.
Tip: HF 3-30, VHF 30-300, UHF 300-3000 MHz.