NEC-LIST: cosecant squared beam

hello

i am a final yaer student in elecricak and electronics and am trying to make
an air survallence radar with a cosecant squared pattern from an array of
dipole antennas by varying the phase and amplitude between elements in the
array. i would be very garefull if any one has any ideas on this, or could
suggest a good book or website to help with the research

cheers

chester

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