Well this is where I am comming from, I am presently building an
antenna for this winter where I will be communicating with the U.K.
Thus my major lobe needs to be robust between about 10 degtrees and 4
degrees to ensnare most of the communication. Notwithstanding that the
upper half of the major lobe serves no usefull purpose to what the
antenna is required for there is a mass of radiation in many directions
and levels that have no connection to the required purpose of the
antenna, thus we have a lot of wasted radiation that if we harness it
so that it is used for the antennas primary use the efficiency of the
antenna would increase immensly. So to the question, accepting that the
major lobe is required in its entirety for the antennas required use I
feel that less than 50% of available radiation is used for the antennas
design usage and that also includes the upper lobe as not being a
positive contributor
However I have no real figures to hang my hat on........ O.K.?
Art

Tom Ring wrote:
art wrote:

When one looks at a.radiating array pattern one can see that the yagi
is very inefficient. Does anybody know of the relative volume
Art


Art

Yagis, when made of almost anything but something like nichrome wire,
are very efficient. Aluminum element yagis run in the high 90's of
percent efficiency when properly designed.

My bet is that you aren't speaking of efficiency at all, but something
you don't know the words to express. Try to explain what you mean, and
this group may be able to help you.

tom
K0TAR