[Antennas] Multiple dipole spacing

[R Goodspeed (W7DGX)]

Gentlemen,

I want to build a multiple dipole arrangement with one single feed
point, and the higher frequency dipoles hanging below the lowest
frequency dipole. The desired bands are 20 meters, 17 meters, 12 meters,
and 10 meters.

What separation spacing is required to assure no flashover or melting
will occur using legal limit power. Is PVC pipe good enough to be the
spreaders to maintain the dipole separation spacing. Ten foot lengths of
schedule 40 pipe is $1.44. Are one or two feet separations sufficient??

=46rom my reading, the spacing must be greatest at the ends of the
dipoles, because it is the highest voltage point. Is that true with the
other dipoles being connected at the same time???

How much interaction should I expect? How would that affect the =91normal=
=92
length of a dipole?

Present plans involve hanging the dipole ends from trees with a rope and
pulley arrangement that will allow lower the antennae for adjustments
(and repairs if needed).

Thanks for reading this.

Thanks for any information you folks may provide.

           Rolly W7DGX