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Attenuation due to rain is a major issue for signals at frequencies above 10 GHz, and is noticeable at frequencies above about 1GHz, but if you're talking about broadcast FM radio (~100 MHz), or most common kinds of two-way radios (~50MHz, ~150MHz, ~450MHz, or ~900MHz), then rain fade is too small of an effect to notice. The water droplets in clouds are ...

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