HG>The antenna Tom has is apparently based on the same design philosophy   
   HG>but instead of parasitic elements the number of phased driven elements   
   HG>are increased.   
      
   Exactically. And most references refer to it as an LPDA design   
   The Twin Booms are a modification of the basic design to assist   
   impedence matching. The cross over wiring is used but mostly in TV   
   antennas. But it still is an LPDA antenna   
   ---   
    þ SLMR 2.1a þ Typo Tom Strkes Again   
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