Topband: Future Antenna installation.

[Bill]

I will be moving in about 9 months to a new home in a heavily
wooded 4 acre, low noise area .  I plan to put up a full size
160 meter vertical with an appropriate radial system and a full
size 80 meter vertical with an appropriate radial system.

Question:

In order to minimize interaction between the two verticals, what
should the separation distance between them be?  I intend to have
each vertical fitted with it's own radial system.  No electrical
or physical connection between them.  Except I would image, the coax
shield back at the shack.

K2WH