I just started taking practice tests for the technician license and it seems I probably won't need to study too much to pass it considering there's a lot of basic electronics theory in there.
I'd say get the skinniest antenna that will hold up to your use case, and then sculpt a trailing edge device of some sort. I'm envisioning something like a straw with a tapered trailing edge that inserts over the antenna. It would make it rigid though, which makes it susceptible to damage. The ideal solution would probably be made of foam.
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