[TowerTalk] Ground mounting vs roof mounting verticals

[Jim Brown]

On Thu, 22 Oct 2009 09:18:26 -0700 (PDT), John Geiger wrote:

>For a roof mounted vertical, would 4 quarter wavelength radials for
>each band be sufficient?

Yes. In general, four per band is plenty if the feedpoint is at 
least 1/8 wavelength above the earth. As you get closer than that, 
radials begin to couple to the earth and the earth currents burn TX 
power.

73,

Jim K9YC