On Mon, 24 Jul 2006 08:32:08 -0500, "hasan schiers"
wrote:

The best study I've seen is in both the ARRL Antenna Handbook and in ON4UN's
Low Band DX'ing Handbook. I think it was a 3 station that came up with a
method (consistent with BL&E) that gave a simple formula for putting down
the optimum number and length of radials, for a given length of radial wire
available. I used that study to originally arrive at 50' long radials at
80m. This gave tip to tip separation of about 3 or 4 feet on 80m, which met
his criteria. The material above specifically answers the question: how do
you get the best bang for the buck for a given amount of available radial
wire.

You can find the article and the formula in the August 2004 QST.

Danny, K6MHE