Figure 221 Visual and Wireless LOS Paths

The short wavelength of the green light wave needs to clear the building only by a fraction of an inch to avoid bein g attenuated. All of the green light wave easily clears the building. The longer-wavelength 2.4-GHz wireless wave has a larger Fresnel zone and needs to clear the building by quite a few feet to avoid being attenuated. The next section provides more information about calculating the necessary Fresnel zone clearance.

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