[TowerTalk] Question on Multiple Inverted L Antennas

[Eric Rosenberg]

I have an inverted-L for 160 with 24 radials that works really well. 

I'd like to add 80m and possibly 40m by having those respective vertical
elements attached to the same radial system. 

My question: how far apart must the respective elements -- vertical and
horizontal -- be from each other?  

My concern is a result of there being a single tree (i.e., tie off point)
at each end of the antenna (where the L takes place and at the end of the
horizontal section). 

Your help and advice is greatly appreciated! 

Eric W3DQ 
Washington, DC