Folks,

I've got a question concerning Yagi antenna's: Why (or how) does the
longer
element "reflect" the radio wave, and the shorter element "direct" the

radio wave.

Also, on many multi-element Yagi designs, the norm seems to be just one
reflector, and many director elements. Does this mean that the
reflector is more "effective" than the directors at modifying the
radiation field?
Why are there no designs with just one director, and multiple
reflectors? Why does the shorter element apparently affect the field
more than the longer elements?

I've seen some interesting 3-D graphics of field strength
renderings for antenna's on the Internet, and some software can produce
some
nice looking 2-D graphics to help visualize the H and E fields. Does
anyone know of a site that let's one vary the element lengths, and
watch the effect on the 3-D graphic of the field strength vectors as
the element
lengths are varied?

Cheers!
Chris AI4MI