NEC-LIST: Gain less than 0 dB in NEC?

PL READ MY EARLIER MAIL WITH THIS ONE.
 
As I understand when modelling in NEC, wires are
supposed to be ideal (perfect conductors unless loaded).
Should under any conditions the maximum gain of a
pattern in any direction be less than 0 dB especially
when the pattern has lot of nulls?

I have simulated an antenna structure (could not
 attach becuase perhaps it becomes more than the
 length of email allowed, will do in next mail)
and gain pattern has nulls in certain directions, still
 the maximum gain is less than 0 dbs.

regards, Amin

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