[TowerTalk] vertical distance

[w5jmw at towerfarm.net]

Hello all.I have a phased vertical system.The dxe 75/80 meter verticals 
and the phasing box.I have entertained thoughts on selling.No one wants 
to come and pick them up.SO.I am going to put them up.They will be in 
somewhat of a line with my 55ft tower.What is a safe distance? By that 
what distance so the 55ft tower/w beams.wont see the verticals? 1/4 wave 
is easy.1/2 wave may be a problem...what do you say??