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Well, I do wonder how it could simply remove the unwanted out-of-phase current? Cancelling it seems probable, but wouldn't they cancel one another in doing so? It seems the bad current would cancel the good current. You can't simply expect energy to vanish, it has to go somewhere so I'd expect it would go into the same space as the good current thus causing cancellation of both.


Also, if the lower ¼ wave radiates good current in conjunction with the upper section, I'd expect you'd see gain over the SGM since it would effectively be a collinear monopole, but your tests confirm the performance of the two as equivalent.