Oxides will theoretically add resistance... But in practice, this only has a significant effect if the corrosion/oxidation is at the interface of a connection between two parts. In other words, corroded connections need to be prevented, repaired or replaced... Surface oxidation on an element is for all practical purposes, is only cosmetic issue.
If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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