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T3A11:Which region of the atmosphere can reflect HF radio waves?

T3A11T3A

Which region of the atmosphere can reflect HF radio waves?

Direct answer summary (2026-2030 NCVEC pool)

The official correct answer for T3A11 is The ionosphere.

The key fact is The ionosphere. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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