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by tomfanning
1681 days ago
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Trans-oceanic flights go far beyond the VHF radio horizon to land so routinely use HF radio. It's not a backup, it's the norm. Example: https://www.iaa.ie/air-traffic-management/north-atlantic-com... "Huge" is probably not that big vs VLF. Maybe on the order of ~50m width (~3MHz / ~100m wavelength for ~50m half-wave antennas). VLF is more like wires across entire valleys - kilometres. |
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