Steve,
The radiation resistance of your balloon vertical will be 36 ohms. By the time
you add in ground losses you will be up to around 50 ohms. I would just feed it
at the base and tweak the length to resonate it at 1830 kHz (or whatever you
like). This antenna will cover over 100 kHz with a VSWR below 2:1. I would just
put it up, base feed it, and fine tune it with a good tuner at the shack. As
long as the VSWR is below 6:1 at resonance things should be fine.
Dave WX7G
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