Greetings TOM!   
      
      
    EV>> I forgot to mention I looked at my TV Antenna and it has One Boom,   
    EV>> so it's a Yagi not a LPA.   
      
    TW> It is not the Boom that makes it a Log Periodic. IT is the Director   
    TW> elements.   
      
   No, the boom is like a folded antenna with shortened radials; the twin   
   boom is actually one boom, but the radials are stepped, one on one side,   
   the next on the other side, etc..   
      
    TW> On a standard Yagi they bare al the same length like my VHF   
    TW> Hi Band antenna I use to recieve Ch 8 & 10.   
      
   You're using a VHF antenna to receive UHF digital stations 8 & 10? That's   
   odd.   
      
   The radials shouldn't be the same length. There should be short to long   
   radials as you look from front to back.   
      
   I have two 6 element yagi' that I designed with yagi software and made in   
   my shop in San Diego. They have short to long radials, but the bandwidth   
   of those antennas are not as wide as the Cushcraft 6 element twin to mine.   
      
   The Cushcraft covers 432-450MHz, but mine only covers 440-450 bandwidth.   
   Of course, they'll all cover more, but the design is optimized to cover   
   what I wanted to use those antennas for; UHF repeaters further up the   
   coast from SD beyond LA into the Santa Barbara area. And I did so on a   
   daily basis, from Mira Mesa.   
      
    TW> the Log Periodic has different director lengths with the formt one   
    TW> being the Shortest.   
      
   And they're staggered from one side to the next which is the reason for   
   two booms (which are connected together). Note the electrical schematic of   
   a LPA vs a Yagi. The elements are short to very long so that the antenna   
   can be as broad-banded as required. Especially in a Television antenna   
   that covers VHF channels 2-13 and the UHF channels 15-83, way back when   
   there were more UHF channels than there are today. Cell phone service got   
   the UHF band that 70-83 used.   
      
    TW> Here is a link to some pictures   
      
    TW> http://tinyurl.com/nlnl8ao   
      
   Note the schematic drawing showing a comparison of a yagi vs log perodic   
   (just below the green printed circuit board LPA). Also, the one to the   
   right of the green LPA was/is similar to the LPAs that we built at Solar.   
   The staggering of radials is pretty clear in that photo.   
      
   The LPA that I like on that page is the printed circuit board antennas   
   made by WA5VJB for 2-11GHz...note the bandwidth (9Ghz) and then look at   
   the antenna and note the lengths of each radial. See if you can build a   
   yagi to cover that bandwidth in the same length boom and you'll appreciate   
   the LPAs...   
      
      
       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)