The free 4nec2 software available at the following site might be what you are looking for;
I believe it can also do the antennae types in which you are interested (look at the included examples in "patches" & "wlan" directories after install it).
I have been using FEKO for the past 3 years and it works for me. Ive done patches, horns, helices etc. The latest suite includes a nice GUI in which you can create your antenna model. Go visit www.feko.info and have a look under applications/antenna placement.
For 80% accuracy you can use PCAAD V5 (just 450$) if you need more accurate 3D design use CST (MWS)It more user friendly for 3D then Ansoft (HFSS)
For 2D printed antenna use ZELAND