HF (High Frequency) Communication

High Frequency (HF) communication uses radio waves in the 3 to 30 MHz range to enable long-distance voice, data, or Morse code transmission. These signals can reflect off the Earth's ionosphere, allowing communication over hundreds or thousands of miles without satellites. HF is commonly used by military, maritime, aviation, and amateur radio operators, especially in remote areas or during emergencies. While susceptible to atmospheric conditions and interference, its ability to reach distant locations without infrastructure makes it a vital tool for global communication.