long wave
US /ˈlɔŋ weɪv/
UK /ˈlɔŋ weɪv/
1.
a radio wave of a wavelength greater than 1,000 meters (frequency less than 300 kHz), used for long-distance communication.
:
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Ships at sea often rely on long wave radio for navigation and communication.
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The old radio could pick up stations on the long wave band.