[TowerTalk] stacking 12m beams

[vk3pa at vk3pa.com]

Hi all,
  i have a pair of hy-gain BA/CA125? (modified 5 el 15m beams) beams  
which i want to stack on my 75ft tower..Q, wot is the smallest  
stacking space can i use with usefull gain
73 es tu
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