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==Significance==
In any wave-propagated transmission between a transmitter and receiver, some amount of the radiated wave propagates off-axis (not on the line-of-sight path between transmitter and receiver). This can then [[Reflection (physics)|
The dependence on the interference on clearance is the cause of the [[picket-fencing]] effect when either the radio transmitter or receiver is moving, and the high and low signal strength zones are above and below the receiver's [[Cut-off (electronics)|cut-off threshold]]. The extreme variations of signal strength at the receiver can cause interruptions in the communications link, or even prevent a signal from being received at all.
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