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Which outcome occurs when rainfall causes excessive surface-water film on a microwave transmission antenna?

A)Signal loss increases significantly
B)Antenna impedance remains stable
C)Bandwidth capacity improves slightly
D)Radiation pattern becomes more focused

💡 Explanation

Signal attenuation increases because surface-water film affects microwave transmission via dielectric absorption; the **molecular polarisation** changes the effective impedance and reduces radiated power. Therefore signal loss greatly increases, rather than bandwidth improving or impedance remaining stable under said condition.

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