The culprits are Purple Martens. I love the little guys; they're very entertaining but one of the things they like to do is use the wind vane
like a Merry-Go-Round. They land i=on it and it spins round giving them a ride. Unfortunately it seems to have done something to the vane so it flukes a lot and when it does read seems to read in reverse.
I'm guessing the vane is bent but don't really know. I haven't climbed to the top yet but wondered if anyone had dealt with a similar problem and could give me an idea of what to expect up there? If it's bent will it be possible to straighten it? What are some replacement options?