Weathervanes are traditionally mounted on the highest point of a roof, although there are a few different ways to install a weathervane. You can attach a weathervane’s spire to the ridgepole, which is the vertical member between a roof’s two end rafters.
You can attach it to the top of a cupola, if your house has one, on a support from the inside. You can attach it to the wall with a mounting bracket or the top of the roof with a bracket. A weather vane can also be attached to the top of a pole in your garden.