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Taking 5GHz as an example, if the transmitting and receiving antennas are 5km apart, the radius of the Fresnel area is approximately?

Taking 5GHz as an example, if the transmitting and receiving antennas are 5km apart, the radius of the Fresnel area is approximately?
A . 3.6m
B. 5.6m
C. 8m
D. 9.7m

Answer: C

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