Which propagation mode is affected when atmospheric temperature inversion occurs above a VHF radio communication link?

💡 Explanation

When a temperature inversion exists, warmer air sits above cooler air, bending VHF radio waves earthward via tropospheric ducting because the refractive index changes with temperature and pressure, creating a waveguide effect. Therefore tropospheric ducting is affected, enabling over-the-horizon communication, rather than ground wave which is short range, ionospheric which affects HF, or free-space loss which is always present.

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