[Maine-birds] Mystery bird - help with ID?

Hi all, 

I've been hearing this bird for weeks around my house here in Wayne, throughout the day. The call seems very simple, but I don't recognize it, and Merlin doesn't register at all. I've been trying for weeks with no luck, so thought I'd record it and post it here. Asked some exeperienced birder friends and they were likewise baffled. I have an amplified and un-amplified recording; adjust your volume accordingly. 

I haven't been able to see the bird at all, but we're right by a lake. I think I've only heard one. The pattern I recorded here is by far the most common, though there do seem to be one or two other variations, shorter, with only two to four notes.

Thanks so much for any and all help!

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