[TowerTalk] antenna seperation question

[ww0e at juno.com]

I plan on mounting a CushCraft D3W dipole on the mast above my Mosley 
TA-33JR. What distance should seperate the two antennas to avoid 
interaction. As of now I have between 2 - 3 feet. I can replace the mast 
with a longer one if needed.
 
Thanks,
 
Jerry  WW0E

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