On Sep 11, 2:39*am, Szczepan Bia³ek wrote:
If two sources work, interference take place. Equipments
are "polarised" not waves.
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The net, far-field radiation of two vertical monopoles in a
directional array driven by one transmitter using a power dividing
network is vertically polarised -- because both monopole sources are
vertically polarised.

This type of array is commonly used in commercial AM broadcasting, and
its characteristics (including its polarisation) have been accurately
known for many decades.

RF