Discussion
In which direction does a vertical half wave dipole radiate most strongly?
Answer: D
The maximum is broadside to the wire, so a vertical element radiates towards the horizon, uniformly in azimuth, and has a null straight up. That is exactly what is wanted for terrestrial communication and exactly wrong for a satellite directly overhead. Choosing the orientation of a simple antenna to suit the direction of interest is the first practical decision in any installation.
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