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T3C06:What type of propagation is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?

T3C06T3C

What type of propagation is responsible for allowing over-the-horizon VHF and UHF communications to ranges of approximately 300 miles on a regular basis?

Direct answer summary (2026-2030 NCVEC pool)

The official correct answer for T3C06 is Tropospheric ducting.

The key fact is Tropospheric ducting. 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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More questions in T3C

T3C01Why are simplex UHF signals rarely heard beyond their radio horizon?T3C02What is a characteristic of HF communication compared with communications on VHF and higher frequencies?T3C03What is one characteristic of VHF signals received via auroral backscatter?T3C04Which of the following types of propagation is most commonly associated with occasional strong signals on the 10-, 6-, and 2-meter bands from beyond the radio horizon?T3C05Which of the following effects may allow radio signals to travel beyond obstructions between the transmitting and receiving stations?T3C07What band is best suited for communicating via meteor scatter?