GENERAL The aircraft communication system includes those components and subsystems providing air-to-ground, interphone and cabin
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HF radio becomes low-cost alternative to satellite | High-frequency radio - Urgent Communications article
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aircraft design - Why do planes use wire HF antennas instead of smaller ones used by airliners? - Aviation Stack Exchange
Are commercial aircraft still typically equipped with HF radio? If so, what do the antenna systems look like? - Quora
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