Greetings TOM!   
      
      
    RW> EV>>> I forgot to mention I looked at my TV Antenna and it has One   
    RW> EV>>> Boom, so it's a Yagi not a LPA.   
      
    RW> TW>> It is not the Boom that makes it a Log Periodic. IT is the   
    RW> TW>> Director elements.   
      
    RW>> No, the boom is like a folded antenna with shortened radials; the   
    RW>> twin boom is actually one boom, but the radials are stepped, one on   
    RW>> one side, the next on the other side, etc..   
      
    TW> GOTCHA YOU Roy this time.   
      
   Not this or any other time, Tom.   
      
    TW>  While the twin boom Log periodic popular some are Single Boom and   
    TW> the Differeing lengths of the directors,   
      
   Look at the schematic of a LPA and you'll find that the booms are part of   
   the excited antenna. In a yagi, the boom is only there to support the   
   insulated radials and only the driven element is excited.   
      
    TW> Longest near the radiating element and the shortest the tip of the   
    TW> boom(Single or Dual)is what speperates them form a standard Yagi.   
      
   The scematic will show you the difference. When you see the feed pointa   
   tone end and they're coupled at the other end, there has to be two booms   
   to conform to the schematic.   
      
    RW> TW>> On a standard Yagi they bare al the same length like my VHF   
    RW> TW>> Hi Band antenna I use to recieve Ch 8 & 10.   
      
    RW>> You're using a VHF antenna to receive UHF digital stations 8 & 10?   
    RW>> That's odd.   
      
    TW> NO as I stated I am using a High Band VHF TV antanna. Low Band covers   
    TW> channel 2 thru 6 and High covers Channel 7 thru 13   
      
   No wonder you're not getting all of the HD channels. You need a UHF   
   antenna for those. Channel 8 and 10 are still on VHF, but the rest of   
   the stations in SD are on UHF frequencies. i.e. Channel 6 (calls   
   itself 6.1 now) is now broadcasting on UHF channel 23, etc..   
      
    RW> TW>> the Log Periodic has different director lengths with the formt   
    RW> TW>> one being the Shortest.   
      
    RW>> And they're staggered from one side to the next which is the reason   
    RW>> for two booms (which are connected together). Note the electrical   
    RW>> schematic of a LPA vs a Yagi. The elements are short to very long so   
    RW>> that the antenna can be as broad-banded as required. Especially in a   
    RW>> Television antenna that covers VHF channels 2-13 and the UHF   
    RW>> channels 15-83, way back when there were more UHF channels than   
    RW>> there are today. Cell phone service got the UHF band that 70-83   
    RW>> used.   
      
    TW> Staggered on the twin Boom YES but they are NOT on a Single boom Log   
    TW> periodic   
      
   That's because it is a yagi, not a lpa...   
      
    TW> but the the elements are insulated from the boom and there is a   
    TW> crossover connection at each Left and Righ Element pair as seen   
    TW> on the page I referenced.   
      
   Yeah, and they're connected to the individual booms. Straighten out the   
   schematic and they'll look like a yagi, but it is a LPA (Log Periodic   
   Array) i.e. there is no physical crossover, but there is in a schematic   
   to show that the elements on one boom are connected only to that boom,   
   and the same goes for the other boom.   
      
   Thus!   
      
              ³ ³ ³ ³ ³ ³   
   feed -->+ÄÄÁÄÁÄÁÄÁÄÁÄÁÄ¿   
                          ³ The booms are connected here.   
   point-->+ÄÂÄÂÄÂÄÂÄÂÄÂÄÄÙ   
             ³ ³ ³ ³ ³ ³   
      
      
       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)