NEC-LIST: URBAN ANTENNAS

Hi All,
         I recently received comments from various sources that flat panel
array antennas are unsuitable for use in an urban environment. The reason
given was that since these usually constitute a planar array of elements .
In such a case multiple reflections could result in different phasing
between the various elements and hence lowering og the resultant gain of the
structure.
  Is anyone familiar with this effect? How can one overcome this effect?
what sort of elements would be suitable?
Thanks in advance,
                           Zvi

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