Is there a "set" distance, or "rule of thumb" for how many feet apart two antenna masts should be when installing them in close proximity? I have an existing 33' mast with a UHF/VHF vertical attached. I will be installing on a seperate 33' mast, a HF vertical. I would like these two relatively "next" to each other. I plan moving the UHF/VHF mast since there is a high tree limb that is growing into the antenna, and trimming this limb is near impossible unless I call in a tree service, which I really don't wish to do. Both of these masts will be anchored to the eve of the house, extended to the full 33' and guyed accordingly. Would a distance of ten feet apart seem adequate? I have never considered doing what I am about to do, and I have researched this topic online but have found little to no information about it. I plan on having a shared grounding system with a total of six 8' copper-clad ground rods and using 6 AWG bare copper wire. Are there any concerns I should be made aware of about this setup?