On Wed, 13 Mar 2013 18:09:26 EDT, "Howard Lester"
wrote:

My
recollection (not to be trusted) is that four *elevated* 1/4 wave radials
work well.

2-meter vertical antennas intended for use on the top of masts use
only 3 radials, and they work well. Four elevated radials also should
work.

Dick Grady, AC7EL