Radio Navigationhard#1200
Ducting of radio waves can cause:
A
Complete signal loss
B
Reduced HF range only
C
Extended VHF range well beyond normal line of sight
CorrectD
No practical effects on aviation navigation
Explanation
Atmospheric ducting (caused by temperature inversions) can trap VHF signals in a channel near the surface, extending reception far beyond normal line-of-sight range.
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