High-frequency communications (3-30 MHz) require large antennas. Multiple antenna lengths and/or tuning capability also are needed in order to change bands or use different channels (frequencies) in the same band.  In the world of HF, the ability to change bands or channels within a band is a necessity because no one frequency can be used to reliably communicate from Point A to Point B at all times.  As myriad factors change—e.g., day transitioning to night, the eruption of ...

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