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High Frequency

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HF is stand for high-frequency.It is radio frequency that show the range of the radio wave.This frequency range from 3 and 30 MHz.For your information HF can be send and transmit in the long-range not like the other frequency like UHF,VHF and other band that use direct wave.Actually HF is different then others cause the message that we send using our devices such Communication Radio will not be send direct to the others device but using the bouncing wave that bounce between ionosphere and ground.So that's why it will take time to get the message during daylight because usually the cloud are thick at daylight and at night the ionosphere are thin so it more faster then day.