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From the sound of his write-up, he is probably talking about a vertical array of two 5/8 waves. 

There are a couple of things you should keep in mind.  The first one is that he's using the 'demo' version of the modeling program so it's not going to be very accurate (as he states).  And the other thing is that it's 'isotropic', meaning not 'real world' results or abilities.  Don't get your hopes up too much.  There's a lot he didn't say, so there would be some 'problems' with using the antenna exactly as it's illustrated.

 - 'Doc