G3C04 : What does the term critical angle mean, as applied to radio wave propagation?
A
The long path azimuth of a distant station
B
The short path azimuth of a distant station
C
The lowest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions
D
The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions
Correct Answer: The highest takeoff angle that will return a radio wave to Earth under specific ionospheric conditions