the range of wavelengths at which the earth's atmosphere is transparent to radio waves.
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- radio telescope,
- radio tube,
- radio valve,
- radio wave,
- radio waves,
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a gap in ionospheric reflection that allows radio waves, with frequencies in the range 10 000 to 40 000 megahertz, to pass from or into space
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012