None. As long as you just change just the driven element length.
> The gain is quite broad (very little change clear across the 20 meter band.).
> The f/b is much sharper with frequency.
> I have the elements in a 4NEC2 model if you want to look at the patterns and
> charts. I'd be happy to send them to you. The program is free to download.
>
> I've made similar offers many times to others. No one has ever taken me up
> on my offer, though. But antenna modeling is a fascinating topic that will
> show you all kinds of things about your antenna (such as the effect of
> changing height, what happens if you mount another antenna nearby, etc.)
>
> Rick K2XT
>
I'd like to see your data, Rick.
73, Mike NF4L
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