Strange sounds in sky

YES, today at around 4:15, I woke from a nap hearing faint humming/groaning sounds, take note this is the third incident in a row since october I have encountered so far, anyhow, I walked to the back door and like before, they elevated to a deeper higher pitched tone, almost similar to a typical jet engine, but far more unique sounding (unearthly). I am not entirely certain as to the source of the phenomenon, but I've heard many individuals explain how HAARP is a MAJOR culprit behind suspicious frequency and atmospheric manipulation. I'll keep an ear out for any more bizarre occurrences...stay tuned people of earth.

We heard what you described in central Ohio at around 3:00am today.

There's a youtube video somewhere that debunks these