As an observation... The link below shows how the r-f ground connection loss and system radiation efficiency of a 10m monopole using a set of 32 x 10m radials vary with the conductivity of the earth in which the radials are buried (frequency = 1.85 MHz).
http://i62.photobucket.com/albums/h85/rfry-100/10m_Vert32Buried_Radials.jpg Richard Fry _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
