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Massimo on Twitter: "Difference between AM and FM radio in how it sends its radio signal [read more: https://t.co/QDqDO3qdXx] https://t.co/fMSX7ncui7" / Twitter
Why AM Radio Signals Propogate Farther At Night Than During the Day - YouTube
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Nats S04-14: The Electromagnetic Spectrum
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Why are AM broadcast signals propagated by ground waves during the day and by sky waves at night? - Quora