In 1a the ground and sky waves are synchronising, giving twice the normal signal strength. In 1b they are in opposition and there are weak or no signals.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311009.2.30.1
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Radio Record, Volume V, Issue 13, 9 October 1931, Page 9
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28In 1a the ground and sky waves are synchronising, giving twice the normal signal strength. In 1b they are in opposition and there are weak or no signals. Radio Record, Volume V, Issue 13, 9 October 1931, Page 9
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