A different idea than lug connections, is to use load-center style ground
bars bolted to the metal plate.
http://www.homedepot.com/p/Square-D-23-Terminal-Load-Center-Ground-Bar-Kit-PK23GTACP/100129430
I fully agree this is not up to Bellcore grounding standards. But seems
much more ham-amenable, especially for those of us who unroll many of our
random-gauge radial wires across driveways and lawns on contest weekends
and hook up in cold weather - the clamp screws in the ground bars are
easily worked with a screwdriver in a gloved hand and accomodate any
random-sized-style conductor.
At little verticals no one gets close to, I just twist my wires in a
"coherent lump", flux it with liquid flux, and flood the twisted area with
solder. If I get really sophisticated, I slide a piece of copper pipe over
the twisted area, crimp it, and flood the whole inside with solder.
At towers, where people have to walk over the radials and a bunch of wires
are a PITA, I solder to a square made from copper flashing.
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