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Circular polarization may be referred to as ''right-hand'' or ''left-hand,'' depending on the direction in which the electric field vector rotates. When looking toward the source, right hand circular polarized light rotates clockwise as time increases, and describes a right hand helix along the propagation axis.
==FM radio==
The term "circular polarization" is often used erroneously to describe mixed polarity signals used mostly in [[FM radio]] (87,5 to 108,0 MHz), where a vertical and a horizontal component are propagated simultaneously by a single or a combined array.
This has the effect of producing greater penetration into buildings and difficult reception areas than a signal with just one plane of polarisation.
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