500kHz WSPR

This afternoon I restarted 500kHz WSPR transmissions using about 250uW ERP from the earth electrode "antenna" in the ground. Two reports received from M0BMU at 69km received so far (-24/-25dB S/N). In the next few days I'm hoping to erect a vertical top loaded Marconi antenna to use on both 136 and 500kHz, so it will be interesting to see how reports compare with those obtained on the earth electrode antenna.