Was talking this weekend with Gary, W2INR about the merits of "digital" TV antennas, and oxygen-free speaker wire, and I now have begun exploring AM-rated ground radials made of Aluminum electric fence wire. Besides its special AM ability, I wonder if anyone has first-hand experience with how bare aluminum wire withstands ground burial in soil that ranges toward acidic from organic compost, like out in the woods. Chemical properties look pretty good for the money. It has about 60 percent conductivity compared with copper, and is said to have good resistance to corrosion once it gets a surface coat of oxide. I've had some aluminum jacketed, semi-rigid hardline out in the back yard for more than 20 years, and its main deterioration has come from squirrels gnawing on it rather than exposure to the elements. Another concern is whether I should avoid using a stainless steel ground radial plate because of the risk of galvanic corrosion against aluminum. I know from boating that they use aluminum and zinc as sacrificial anodes to protect steel & stainless steel components in the engine and outdrive. But that presumes immersion in brackish saltwater around here that makes a far more dandy electrolyte than wet soil. Various hits from internet searches recommend using other methods to mount the wires, like copper buss bar, drilled copper pipe, anything BUT an aluminum plate drilled to bolt aluminum ground radial wires. Chief problem seems to be corrosion between the mounting bolts the plate and the wires, where the oxide that naturally forms on the aluminum becomes an issue in an RF environment. Wat say, over, over.