Electromagnetic Field Theory
In case of surface waves the field strength at a point is directly proportional to

Distance of the point from the antenna
Current of the antenna
Wave frequency
Antenna height

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Electromagnetic Field Theory
In microwave communication links, when fading due to rain attenuation occurs then technique adopted for solving the problem would include

Path diversity and frequency diversity
Amplitude timing and phase correction
Polarization shifting and code diversity
Antenna replacement and feed correction

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