Clearly a very 'minor player' in the early 70s scene off the Dutch coast, but it would be nice to find out which ship it was and why it was anchored there.
I wonder if the photos are just a "red herring" so to speak and she was merely a trawler anchored and the aerial is their Marine Frequency radio aerial?
Doesn't explain why there are no registration numbers on her though.
http://www.fleetwood-fishing-industry.co.uk/page/37/
Kev