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radio windowSee atmospheric windows.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
radio window[′rād·ē·ō ‚win·dō]
A band of frequencies extending from about 6 to 30,000 megahertz, in which radiation from the outer universe can enter and travel through the atmosphere of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.