HF (High Frequency) Radio

High Frequency (HF) radio involves radio signals in the 3 to 30 MHz range, capable of long-distance communication by reflecting off the Earth's ionosphere. This allows for effective global transmission without satellites or internet. HF radios are used by ships, aircraft, military, and emergency services to maintain reliable communication over thousands of miles, especially where other systems may be unavailable. They require specialized antennas and adjustments to optimize signal clarity and strength, but they are highly valuable for their ability to reach remote or isolated locations worldwide.