hi jim
check 
http://www.cebik.com
dr. cebik may already have a model created on file
or in one of the papers he has written.
Jim   wrote:
  I'm new to EZNEC, and not too skilled but trying to learn. Does
 anyone have a .ez file for a corner connected half square they would
 be willing to share? If so, please EMAIL it to  .
 Thanks!