skip zone

The zone or dead area in a geographic region, outside the ground-wave radius, in which F-layer signals are not returned to the earth. The outer edge of the skip zone is at the minimum distance at which the sky-wave signals are received; the inner edge is at the maximum limit of the reception of the ground-wave signals.
A message transmitted from transmitter X is heard at receiver Z, but not at receiver Y.

Aviation dictionary. 2014.

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