[TowerTalk] Yagi mounting on a tower face

[KO7AA]

I'm putting a 4 el 15M yagi on one of the faces of Rohn 55 size tower. The direction is perfect, so the boom will simply be attached to two tower legs, no rotor is involved. How far away from the tower leg should the closest element be (in this case the first director)? Does it matter? Thanks.
   
  Bill, KO7AA in Tucson

 		
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