Balance woun't be the problem, Doug. The problem is that over that long a
run, the feedline will radiate, and become a major part of the antenna
system. The other problem is keeping the feedline far enough away from
eveyerything else along that run, that could interact with it.

For such a long run with a feeder at ground-level, you might want to
investigate low-loss coax...

- Mike KI6PR
El Rancho R.F., CA

"DOUGLAS SNOWDEN" wrote
I am planning on putting up a ground mounted vertical for 40 and 80
meters.
Somewhere between 70-90 ft tall
and insulated from the ground. The antenna will be about 275 ft from the
shack. My question: is it advisable to feed a vertical with open wire
feeder? I am thinking it would work ok either directly or through a balun
on one or each end of the feedline, but how does one keep the RF from the
radiator from unbalancing the line? Or would it just tend to hit both
sides
of the line and not upset the balance?

Doug, N4IJ