You can do both. You can either compute the position and normal of these elements and put them in a ConformalArray, see the first example here
Or if you want to plot a pattern, you can pass in a weights and put ones and zeros in it to indicate which element is active, like
array = phased.UCA(11);
pattern(array,1e9,'Weights',[ones(3,1); zeros(5,1); ones(3,1)]);
HTH
