I understand that broadcasting arrays are strictly controlled
so I wondered if an array that could radiate in pre designated
areas would be useful as it would not require a reflector to repell
radiation.
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Examples in use for many decades already are the directional arrays used in
AM broadcasting, where all elements (towers) in the array are driven. The
element spacings & orientations, and the relative power & phase applied to
each element determine the net radiation pattern of the array.

RF