The best replacement for vane is vain.

The best alternatives to vane are rated as following:
★★★★★  vain
★★★★  vein
★★★  feather
★★★  hot wire anemometer
★★  blackbeard
★  autopilot
★  in vain
★  blazer vane
★  weather vane
  rotary screw
  liquid ring
  4 vane
  in that vein
  wind vane
  in vein

Your alternative for vane is not listed? Suggest!
Speaking about vane, one probably shouldn't forget about anemometer.

Other search terms related to vane and their ratings are:
★★★★★ anemometer
★★★★ wind speed
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