My plan has been to use a rooftop mount setup to save on tower structure and wire run. My pole barn seems to catch pretty good wind and I can run the wires down into the barn to the inverter.
While I was trolling for the right auction for blades I built a mini windmill. I used a plastic boxfan blade and a spindle from a mower deck, mounted it on a portable structure for testing. It works well, I can see the direction and relative speed of the wind by just glancing out the window.
I've tried it in a few places, and the picture shows my favorite so far. It's at the west end of the roof.