ORIGINAL MESSAGE:

chris wrote:

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?


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In a sense, yes it is more effective. Think about it this way: If the
reflector does its job, there is no more energy behind it to be
reflected any further. Just the opposite with a director. The more it
directs the energy, the more there is to be further directed.

When yagis first became popular there were designs published with two
or more reflectors. People soon realized the second one added little or
nothing and they disappeared.

I suppose if you want really exceptional F/B ratio you could use a
second reflector, but most people don't bother. One is enough.

Bill, W6WRT