Topband: Voltage at top of vertical and scaling?

[Jim Miller]

Is there any data on what the voltage might be at the top of a full size
80m vertical at 1500w input?

Is there some zener like ionization at the top that limits the voltage?

If so is there a way to estimate the voltage at lower points along the
vertical? I assume the scaling wouldn't be linear since starting at the
bottom on 36 ohms (sorta) and going to "infinity" at the top would preclude
that.

Thanks

jim ab3cv