What is always required to establish a high quality 2.4 GHz RF link at a distance of 3 miles (5 kilometers)?
A. Minimum output power level of 2 W
B. Accurate Earth Bulge calculations
C. Grid antennas at each endpoint
D. A minimum antenna gain of 11 dBi at both endpoints
E. A Fresnel Zone that is at least 60% clear of obstructions
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