Last evening and overnight I tried 630m WSPR RX using my earth-electrode "antenna" in the ground.
There were fewer stations received and the reports were weaker than the night before when I was using the coax up to my 2m big-wheel via an ATU.
It is hard to be categorical as conditions might have been different, the antennas better in some directions, etc..
My overall conclusion, with these caveats, is that the earth electrode was, at worse, about 1 S point inferior to the antenna used on the night before. I would expect this to be somewhat down on an antenna optimised for the band. So, maybe just 2 S points down. Considering the total lack of hassle, it is far from bad.
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