At 1103z, I decided to try 160m FT8 QRP with 2.5w and the earth-electrode "antenna". It is now 1109z and so far no spots, although it is daylight.
(UPDATE 1434z: 3 G spots of my 2.5W QRP 160m FT8 TX. No spots yet on RX.
UPDATE 1532z: The first DX has started to appear with DK3UA (869km) on the Baltic coast of Germany about 70 miles north of Berlin. Still just 3 G spots of my 2.5W FT8 160m QRP.