In recent days there has been quite a lot of work on different VLF frequencies (as low as 970Hz) by amateurs trying to receive carriers and short messages at great range, including from Germany to the UK. In a recent posting DG4RBF gave details of his latest pre-amp. I have no idea if it does the job. The text is in German, so you have to translate if you want it in English. Use Google translate?
See
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