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Those radial(s) can be anything conductive.  As has been said, wire will work fine but you have to support it in some way.  Big?  Well, no bigger than any other 1/4 wave 11 meter groundplane type antenna.  How long? Somewhere between 8 1/2 feet to 9 feet long give or take a couple of inches.  Basically, the same length as the vertical element.  Or, mount that vertical part a foot or so off the ground and lay the radials on the ground, it works.  You'll have to tune the thing no matter how high it is.

 - 'Doc