Section 171.313

14 CFR Ch. I (1-1-19 Edition)

(5) Antenna far field pattern in the
vertical plane. The azimuth antenna
free space radiation pattern below the
horizon must have a slope of at least
Section8 dB/degree at the horizon and all
sidelobes below the horizon must be at
least 13 dB below the pattern peak. The
antenna radiation pattern above the
horizon must satisfy both the system

coverage requirements and the spurious radiation requirement.
(6) Data antenna. The data antenna
must have horizontal and vertical patterns as required for its function.
(g) Back azimuth coverage requirements. The back azimuth equipment
where used must provide guidance information in at least the following volume of space (see Figure 11):

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