.com...
i dont know why you cant seem to find what your looking for other than
your not wording the search right

Finding them is not the problem. Finding two that come even close to
giving the same dimensions is the problem (apart from ones that are
obvioulsy direct copies of a design on another site.)

Why should this be a problem?

Yagi-Uda antennas are complex beasts, due to the interactions between
the various elements. There is no single "best" design for all
uses... different designs are optimized for different parameters. If
you try to push the optimization quite hard in favor of one design
factor (e.g. maximum forward gain, or maximum front/back ratio) you're
likely to pay a price in terms of sub-optimal behavior in other
parameters (e.g. very narrow SWR bandwidth).

Many older Yagi-Uda designs were done by cut/try/measure methods.
More recent designs often take advantage of modern computer modelling
and optimization techniques, and can vary significantly from the older
designs. I would imagine that most (almost all?) of the published
designs meet their design goals pretty well, despite the differences
in the details of their construction.

Want a simple, direct-coaxial-attachment Yagi with a 50-ohm feedpoint
impedance? You can have one. Want a Yagi with a narrower element
spacing and lower feedpoint impedance which is conveniently matched
using a double-parallel-quarter-wave section of RG59? You can have
that, too. Want a ultra-short-beam Yagi to fit on a small roof and
not stick out into the neighbor's trees? You can have that, too.
These three different Yagi antennas will look rather different from
one another, since they're optimized for different goals.

So, you ought to first decide what you want, in an antenna... what the
importance of the various design parameters are. Then, choose a
decent design tool and go at it! Even better, try two or three
different design tools, and see how the resulting antennas model out.

Finally, build the darned thing, get on the air, and don't sweat that
last dB or so of gain or F/B ratio. "The best, is often the enemy of
the good" - if you focus too hard on having the Ultimate (Yagi, or
car, or whatever) you're likely to miss the pleasure of having a good
one to use, much sooner.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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