Most common
masthead windvanes, like the popular Windex, either come with mounting hardware or you can buy a universal kit. See link. You'll probably need to make about 2 trips aloft: 1. to look around and survey the masthead and 2. to bring with you the needed tools and windvane to mount. As a minimum, you'll probably need a manual or portable electric drill to drill the mounting holes and a suitable screwdriver. I think a windvane is a very important and handy device which makes sailing both easier and more fun. Good luck with yours.
