Hello Bruce.
26 Aug 97 12:25, Bruce LeGrande wrote to Mark Magill:
 BL> Mark Magill wrote in a message to Roy Witt:
 BL>
 RW>> Saves a whole lotta work. I use that in my commercial ground
 RW>> plane antennas that I sell.  Also, in the ground plane, I
 RW>> allow 5% longer radials by using this formula; 2880/146.5  =
 RW>> 19.6587"
 BL>
 MM>> Out of idle curiosity, why the extra 5%?
 BL>
 BL> I could be wrong on this (correct if so - Roy), but I believe
 BL> the added 5% changes the feedpoint impedance to more closely
 BL> match the feedline, just as the drooping of radials at a 45 deg
 BL> angle changes it as well...  I don't remember (from the tech-ref)
 BL> which way it changes, but know that it does :)
 BL>  I wouldn't be surprised if the added length on the radials changes
 BL> the arrays' angle of radiation, too...
Yes..
Here's the key.  Making the radials 5% longer makes the antenna radiate at a 
higher than horizon angle.  Around here, most repeaters are on mountain tops 
over 2200 feet.  Bending the radials down to 45ø does the impedence matching.
... The weather is here, wish you were beautiful!
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