I noticed in Chapter 8 of W2PV's Yagi book, he shows that for a 20 meter
Yagi on a 54 foot boom, there is little difference in gain whether you use
4, 5, or 6 elements. What I don't understand is why you never hear of a 54
ft 4 ele Yagi, but 5's and even 6's are commonplace. This is kind of
analogous to the question of why people bother with 4 element Yagi's on a 30
ft boom when a 3 element on that boom has slightly more gain. I notice in
the ARRL antenna book, there are a bunch of reference designs for Yagis.
The 10 meter ones are more widespaced (in wavelengths) than the 20 meter
ones. Why? Seems like they should be scale models of each other. Am I
missing something here?
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