[TowerTalk] Effect of element shape was: Re: InnovAntennas contact info

[Richard (Rick) Karlquist]

On 3/21/2013 5:45 AM, Stan Stockton wrote:
> Steve,
>
> Yes.  Take a look at the little mono banders we have on our website  www.cycle-24.com.
>
> On many Yagi antennas you will see one frequency where there is huge front to back.  With these designs we have listed huge front to back extends across the entire band.  The antennas are modeled using EZNEC Pro/4 (NEC4).   Actual models built and installed show these results in the real world as best we can test them.

OK, I looked at www.cycle-24.com

For the tribander, pattern vs frequency is shown.  Good.

For the monobanders, only center frequency gain
and pattern are shown.  Bad (but par for the course).

But even these are only "typical" or "modeled" numbers.
(Ever notice how modeled antennas have zero mechanical
tolerances?)  Ideally, there should be a guaranteed (worst case)
minimum gain number over the band taking into account
tuning tolerances.

Rick N6RK