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Hi Guys: Looks like some neat stuff.
1) How thick is that material ?
You always could double to triple the thickness to last longer.
You know copper can eventually corroded and disappear and it depends on it’s enviroment.
In my personal opinion.
Copper be the best way to go, All the antennas and grounds i have done over the years the copper was the best especially if you want to sqeeze every juice and range out of your transmitter.
You alway could go to junk yard, Dumps. building development to see if you can get scraps.
Another idea You could use scrap copper pipe piece it together then flatten with hammer and stick in ground.
You also could use the mesh as your antenna as well beside as a ground and should also help your bandwidth out as well.
Could wrap the mesh around a pvc pipe for your antenna.
Hope this helps