How does the VHF/UHF radio horizon compare to the geographic horizon?
It is approximately 15 percent farther✓Correct answer
It is approximately 20 percent nearer
It is approximately 50 percent farther
They are approximately the same
Explanation
The refractive index of the lower atmosphere decreases with height, so VHF and UHF rays bend gently downward and reach roughly 15 percent beyond the straight-line geometric horizon. The remaining choices either reverse the effect or ignore atmospheric refraction altogether.