[Antennaware] seperation of hf and vhf antenna

[Commander John]

I am planning to install  144 and 440 circular beams for the satellites.  I also want to work repeaters etc so I am planning to mount them on a 25' pole[from ground] on the side of my house.  On the other side of my ranch house is the 80 meter windom antenna used 160-15 meters at 1500 watts.
   
  Does anyone know for sure how far away the antenna for vhf/uhf need to be so that I don't blow it up the multimode radio when I use the commander ? 
   
  thanks
  john kb9tc