Posted by Tony Estep on Dec 21, 2010; 3:14am URL: http://elecraft.85.s1.nabble.com/Inverted-L-was-OT-Vertical-antenna-tp5852957p5854628.html
For those who wish to pursue the radials question further, here's one of the
many publications on the subject. This one is replete with numerous tables
and graphical representations of the incremental value of more and longer
radials in various types of soil: