Helical antennas are often used for satellite tracking at VHF because

1.	Helical antennas are often used for satellite tracking at VHF because of
A.	Troposcatter
B.	Superrefraction
C.	Ionospheric refraction
D.	The Faraday effect
Answer» E.

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Helical antennas are often used for satellite tracking at VHF because of

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