That is the only sure way of knowing. Modeling with EZNEC will
certainly reveal obvious problems.

Yes, that is a possibility, although properly interpreting EZNEC results is often not easy. I will try anyway

Total resistance over 8 meters is 1 Ohm? If so, it does not look like
a problem. 1 Ohm every 10cM? Still does not look like a problem.

Well, one ohm is just the order of magnitude. It will be neither one tenth of a ohm, nor 10 ohms. Moreover resistance will vary along the rod due to the very significant diameter change, and RF current is not constant along the rod either. I am beginning to fear that the only way to really understand how things go is to buy the rod, build the antenna, apply high power ( 1kW) to it for 15 minutes, and the touch the rod to determine whether its temperature has raised somewhat.

73

Tony I0JX