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You know, it's precisely because it's a 1/4 wave groundplane with no matching system (other than the positioning of those radial) that I find a 3 or 4 Mhz usable bandwidth as exceptional.  The pictured graph of those SWR sweeps is also confusing (intentionally I think).  Either information was left out or it's to confuse the results.  Those graphs are not typical at all.  And why would lengthening those radials produce an exact reverse result than the shorter radials?  I'd love to hear the reasoning behind it!

 - 'Doc


...and those frequencies at the top of the graph have no relation to what's displayed on that graph.