"Ghost" Images
On Television Receivers Me r[WLEVISION experimenters ive frequently noticed two or more identical "ghost" images fading and shifting in the background of.the strong image. The cause is attributed to the reception of the. signal over two or more paths from the transmitter, one path being by the ground wave and the others by the sky waves reflected from various heights. Tests have so far revealed that the ghostly effect is noticeable only during the twilight period, possibly because the ground and sky waves are about equal in energy at that time.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310522.2.6
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Radio Record, Volume IV, Issue 45, 22 May 1931, Page 2
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93"Ghost" Images Radio Record, Volume IV, Issue 45, 22 May 1931, Page 2
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