URGENT Help me ///can the directivity be less than 1 in cst mws

hi all
i am tring to plot the radiation pattern of a monopole printed antenna with cst (in gain ieee and polar plot with phi=0 and 90 degress and theta variable )
i got results where it shows that the results iaccurate and directivity less than one ie the radiation pattern is moving out of 0 db what mistake i commited in simulations
the gain vs frequency curve of the antenna is fron 2dB to 5dB.no problem here
I want to plot the curves as seen here( any of these types)
which software should i use to plot E and H plane at say 3 GHz on same polar plots from the cst exported files
regards
kartik

how to get plots in third picture
is the third picture plot correct
what does it mean when gain is not -ve in db
ie above odb

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