In a message dated 05-19-14, Roy Witt said to Holger Granholm:   
      
   Hi Roy,   
      
    RW>> Here's a vertically polarized LPDA:   
      
      
    RW>>           + what are these?   
    RW>>           | +   
    RW>>           | | +   
    RW>>           | | | +   
    RW>>           | | | | +   
    RW>>           | | | | |   
    RW>>  closed|------------+----feed point   
    RW>>    loop|____________+----feed point   
    RW>>          | | | | |   
    RW>>          | | | | +   
    RW>>          | | | +   
    RW>>          | | +   
    RW>>          | +   
    RW>>          + and these?   
      
    HG> All "these?" are driven elements cut to lengths for various   
    HG> frequencies within a specified frequency band.   
      
   RW>Actually, they're all passive until either a received signal excites   
   RW>them or a xmitted signal does. Usually, depending on the number of   
   RW>elements and their lengths, there are active zones and inactive zones   
      
   Correct.   
      
    HG> This antenna has been fully described in the Ham Radio magazine with   
    HG> element lenghts for various bands of frequencies.   
      
   RW>Perhaps, but who reads magazines these days? Formulas for finding the   
   RW>lengths of elements and booms are available on the internet and readily   
   RW>used to design any LPDA for whatever use you have in mind.   
      
   Well, magazines have a longer shelf life than any electronic media I   
   know of.   
      
   73 de Sam, OH0NC   
      
   aka Holger   
      
   ___   
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