Mystery Thing Hangs From House

What do YOU think THIS THING is, that is hanging from my house? It has a very specific purpose, and it might not be what you think!

I built it the other day to see if it works. There are a lot of videos on YouTube showing how to make them and they apparently work. I'm waiting to see it it does.

And yes, I am aware that I need to power wash my siding - that's what I'm doing this weekend.

What do you think it is?

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