For the last hour or so I have been on 472kHz RX (no preamp) and TX (5mW ERP) with the earth-electrode "antenna" in the ground. I went QRT on 10m and 6m WSPR at the same time. So far this evening best DX with 5mW ERP is 223km and 995km on RX. It be interesting to see if I can spot EA5DOM without the preamp.
UPDATE 2024z: Best DX on TX with 5mW ERP and the earth-electrode "antenna" in the ground is PA3ABK (306km). At the moment, most stations are only just copying my weak 5mW ERP signal. I think copying this weak signal is quite challenging for most MF people.