On 4/29/20 12:31 AM, David Gilbert wrote:
Agree on all of that, which is why I agreed it isn't a dominant effect.
And of course you and K6STI have a good point about the additional wind
loading of mid-element coils.
Every commercial coil loaded shorty-40 antenna that I know of puts the
coils out on the elements, though, so I suspect it may be worth the
bother if done right.
73,
Dave AB7E
I suspect that it's driven by 3 things:
1) commonality of parts for different models of antennas (i.e. you only
need one kind of boom/element clamp or other aspects for manufacturing
convenience)
2) mechanical design (previous comments about cantilever loads, and the
general complexity of attaching stuff)
3) buyer preference - product differentiation (the buyer likes how it
"looks" or is influenced by other factors)
RF performance (particularly forward gain) is probably a wash for
"practical" designs, and most hams aren't going to buy one of each and
evaluate whether the side and backlobe shapes are "best" for their
operating style.
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