16 Jun 2010
Three people copied me - M0BMU, G7NKS and M0JXM with reports between -21 and -28dB S/N. The wire to the furtherest ground rod is at most 20m long and most of the way it is 1.5m above ground. Once again, this must be acting as a pretty effective loop mostly within the ground. Screen grab of the WSPR log attached.
So, if you live on clunchy chalk soils like me then don't worry too much about big antennas, :-)