Topband: Bobtail curtain

[Charles Bibb]

I wish someone familiar with using EZNEC would explain this to me:

Just for fun, I thought I would model the well-known bobtail curtain 
array. I say "just for fun" because I know I'll never be able to put 
up a full-sized one for 160M, so I thought I might investigate how it 
would work with reduced height vertical elements. First step, I 
thought, would be to model a full-sized one, and then play around with it.

Here's the problem though. Every time I try to model a full-sized 
bobtail using five wires everything looks good until I run an FF plot 
in the vertical plane. Every time, the elevation angle is very high 
(64 degrees, I think it was). I thought the bobtail was supposed to 
be a good low-angle radiator, like the vertical elements it is composed of.

What's going on? What am I doing wrong?

Charles - K5ZK