And can anyone recommend a good antenna to use for AIS - I presume any decent VHF antenna will do?
As stated Tarbat, any antenna suitable for VHF will do the trick.
I my self use a combi antenna for HAM use, it's a 2mtr/70cm (144/430 mHz) antenna,
length abt. 2.40 meters.
But you really need just an antenna for 2 meter band ofcourse!
You can find find various self built projects on the internet, but in your area, with strong winds, you need a robust antenna.
Quality of coax cable is less critical then for 1090 mHz, but I wouldn't go for less then RG213