SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/ham-ionosphere-reflects-hf

Which region of the atmosphere can reflect HF radio waves?

The ionosphere.

  1. The troposphere
  2. The ionosphere ✔
  3. The stratosphere

Why: The ionosphere is a layer high in the atmosphere charged by the sun. It bends HF signals back to Earth, letting them travel very long distances.

Huh, didn't know that: Long-distance ionospheric propagation is far more common on HF than on VHF.

The dad joke
Why does the ionosphere make a great friend? It always reflects on what you said.
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Sources

  1. NCVEC 2026-2030 Technician Question Pool (Element 2), errata Feb 19, 2026 https://www.ncvec.org/downloads/2026-2030%20Technician%20Pool%20and%20Syllabus%20Public%20Release%20Feb%2019%202026.pdf

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