I suppose with computer modeling, it is now possible to predict all the parameters of a Yagi Antenna. But, I still like the idea of an Antenna actually being tested on an antenna range, if for no other reason then to verify that the computer predictions hold true for the assembled production antenna.
I am a bit confused when it comes to computer modeling triband yagi's with traps. I was told it could not be done, but then I read on Tower Talk that the Hy Gain Explorer 14 I own was "computer modeled to perfection" by Roger Cox at Hy Gain ?
I have also noted that ARRL considers computer modeling to be so accurate, they now allow computer generated gain numbers to be advertised in QST.
Maybe Ham Nation will one day get hold of an antenna engineer who develops triband and monoband Yagi's, and have him take us through the design process !