Overnight on 472kHz WSPR TX : 20 stations spotted my 10mW ERP!

Overnight I was on 472kHz WSPR transmit using 10mW ERP from the earth-electrode "antenna" in the ground. In all, 20 stations spotted me with the best DX spot being by LA8AV (1035km)in Norway overnight. In the last 2 weeks, I have been spotted by 40 stations on 472kHz WSPR TX when running 10mW ERP from my earth-electrode "antenna" in the ground.

Overnight on 472kHz WSPR TX (10mW ERP)