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If I understand you're exact point BM, I would tend to think like inductive coil theory suggest, that the inductor tends to raise the current a bit higher up the radiator, and that is why the radiator may perform a tad better, but again...like I tend to say so often, "...how much difference does it make."

 

In this case, looking at some current distribution tabular values on various antennas and some with coils, I see very little difference ascribed to the ideas noted in the use of these big coils near the middle of a mobile radiator. However, the current response does tend to follow the rule.

 

If this is not what you have in mind, let me know, and tell me more as to what is on your mind.