Greetings Holger!   
      
    HG>> In the RSGB VHF/UHF Manual that antenna type is called "Log-periodic   
    HG>> Yagi bandpass antenna". That is also the basis for the "Swan Yagi"   
    HG>> as made by the Swan TV antenna manufacturer in the US and also   
    HG>> presented by Ed Tilton, W1HDQ in the QST magazine.   
      
    RW>> I think you'll find that Swan has been out of business for decades   
    RW>> and Ed died in 1997...   
      
    HG> So what?   
      
   Buttons. Swan antennas are no longer available, nor has anyone taken over   
   where Swan left off. They tried, but the designs and equipment soon died   
   after Swan left the building.   
      
    HG> Does that diminish their impact on the technical progress!   
      
   Of course not. In fact you'll find much newer progress by younger people   
   who carry PHd's in Engineering and probably have never heard of those old   
   timers.   
      
      
       Have a day!   
      
            R\%/itt - K5RXT   
      
   --- GoldED+/W32 1.1.5-31012   
   --- D'Bridge 3.99   
    * Origin: HAM Radio, aka Amateur Radio. 804? Over! (1:387/22)