I suggest that you go to the chandlers and see what they have got.
You are looking for a VHF marine band antenna.
Most of the ones I have seen are built into a fibreglass tube and have a coax connector on one end.
Mount it on your boat, connect the coax from radio to antenna and you should be good to go.
Try something like this:
https://www.electro-tech-online.com/custompdfs/2009/06/VHF-mast.pdf
JimB
You are looking for a VHF marine band antenna.
Most of the ones I have seen are built into a fibreglass tube and have a coax connector on one end.
Mount it on your boat, connect the coax from radio to antenna and you should be good to go.
Try something like this:
https://www.electro-tech-online.com/custompdfs/2009/06/VHF-mast.pdf
JimB