Which description of the antenna is hanging high is correct when the WLAN is covered?

Which description of the antenna is hanging high is correct when the WLAN is covered?
A . To ensure coverage of larger areas, the antenna should be as high as possible
B . To ensure that there is no tower under the black, the antenna should be as low as possible
C . directional antenna hanging is not recommended more than 12m
D . omnidirectional antenna hanging high recommended more than 12m

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Answer: C