Alex Draper writes in a message to Chris Boone
 AD> If i put 4 dipoles around the mast  at 90 degree placement, 
 AD> this would give me 3db and 8 dipoles  would give me 6db circular 
 AD> pattern? 
Yup. that's the way it works...
  
 AD> Should the dipoles be 1/4 wave  from the mast?
  
Antenna Specialists seems to run them at 1/8 wavelength on their commercial 
jobs...
  
Alex Draper writes in a message to Chris Boone
 AD> Also, do you know how they couple these dipoles to  one feedline?
The feedlines between the elements are phased - I don't know how many 
degrees.  On my ASP unit (2 bays) the feedline is 50 ohms - probably 1 
wavelength long, but it shouldn't make a difference.  This is split to 2 
unknown impedence feedlines at what appears to be a simple "T".  These lines 
are each 1/4 electrical wavelength long, then there is a splice to another 
piece of unknown impedence feedline that is 1 wavelength long.  My elements 
for the low end of the VHF business band were spaced 56-3/4 inches.  And no, 
I am *not* going to tear apart the feedlines to see what's under that splice! 
   I would imagine that the short pieces are 75 ohm and the long pieces 
are 50 ohms or vice-versa.
  
For what it's worth, I have seen UHF yagis phased with 2 pieces of (about 2 
wavelength) 75 ohm cable to a "T" where it connects to the 50 ohm feedline.
 
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