John, GM4SLV wrote:

I had a question posed by a DL station about the legality of working us
- since we're outside the normal "amateur service". My opinion is it's
fine. I've asked John Gould for the official line but intend to
continue with it as it helps my "research" to work and get reports from
as many stations, as far away, as possible.

We used to have X band QSOs on 73kHz without official problems.

Regards

Peter, G3LDO