Can anyone throw some light on the information published in the ARRL
Antenna Handbook for the 6 element 20 metre log-yagi.
In earlier editions, the gain of this antenna was, I am told, given
as 11.5 to 15 dBd depending on boom length. In my book, 17th
edition, the gain is shown as 6.7 dBi. Some reduction!
I have several antenna modelling programmes but none of them allow
more than one driven element, so I cannot estimate what the gain
might be. For a 26.5 ft boom and 6 elements, I would expect
something like 9 or 10 dBd.
Throw some pearls of wisdom at me over this please. I am looking at
a simple 4 el 20m monobander or the above log-yagi which both have
the same boom length.
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