http://coastradio.intco.biz/uk/gkr/history.htm

Very interesting.

I doubt if you will be able to research the FishFone I'm talking about, it was a name given by Radio Amateurs to the Trawler Band some years ago.

Thank you, I shall research this fishfone and look for pictures too.

The wire aerial running between the masts is what radio hams call an inverted L, it is tuned against the hull of the boat and the seawater and unlike a half wave dipole it only needs to be a quarter wave long, or less with a loading coil and an aerial tuning unit, often built into the transmitter. Common on many fishing boats in the days of the Trawler band, which is the frequency band a bit above medium wave. Trawler Band was also nicknamed FishFone.If you mean the loop aerial on the wheelhouse, that is a Radio Direction Finder Aerial which became very popular just after WW11. This information comes to you courtesy of my Radio Ham partner.

I put the beads on the wire to not catch it when removing the cabin. I was afraid of snagging it. The beads are clearly seen in my bifocals 🤓

Hi Ron,

Most likely 50's onward!
That antenna is an RDF "Radio Direction Finder"!
Chances are very high.
There would be one on the type of vessel.
Your model represents
So, Yes I would put it on your model!

Regards, Ed