Sounds like your defining exactly what happens if you raise the antenna...

"Jack Painter" wrote in message
news:lQYbe.241$qV3.90@lakeread04...
.......Snip......
But the efficiency differences have never been equivalent to the antenna
being at a different elevation because of soil conditions. Now maybe I get
away with less ground loss from a half-wave dipole that is not quite a
half-wave above ground, because my soil is very sandy, is that what you
meant? It doesn't change the electrical height of my antenna any, but the
soil is such a lousy conductor that less is absorbed by a slightly too-low
antenna.

Jack