[TowerTalk] TIA/EIA 222-F Antenna Calcs

[Steve Mathias]

I'm new to the antenna world, and have run into a roadblock as to how to apply the 222-F standard to antenna arrays.  I can readily calculate the frontal projected area of an antenna, but I'm not sure of how to handle the case where there is a 4-around array of elements.  In such a case, do I just take twice the side projected area for those two elements facing sideways into the wind?  What about the element facing downwind - is there some percentage of shielding that should be applied to this area, since it is behind the tower?  Or, does it contribute the full frontal projected area as well (which would seem wrong)?
 
It appears as though the standard is quite well suited and comprehensive for towers themselves, but that the "appurtenances" section (2.3.10) is pretty simplistic and incomplete.  Can anyone point me toward more information on this, or someone who might be able to help me, even in a consulting capacity?

		
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