Gadgets to keep woodpeckers away

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I wonder if any of you came up with an effective gizmo that deters  
woodpeckers from cedar siding of a house, in my case a tall chimney.
I've tried shiny streamers that were effective till they were thorn away  
by the first wind storm and I am now too old to climb ladders to replace  
them after every storm. I also tried a fake owl near the chimney, but  
that didn't fool those peckers for very long. I've seen some electronic  
gizmos online, but I'd like to hear from somebody who has actually tried  
them and was satisfied with the result.

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