These are all sirens between Columbus, OH and Chicago that I took on a trip recently:
#1: WPS-2905 in Dublin, OH (discussed earlier in the thread, sorry for the poor quality)
#2: WPS-4004 on 70 Eastbound Franklin County, OH (this may be the one that was thought to be on 270)
#3: 508-128 on 70 Eastbound near Greenfield, IN
#4: Sentry 20V2T near Lebanon, IN on 65 going southeast
#5: Another Sentry 20V2T near Lebanon, IN on 65 going southeast
My apologies for the photobucket watermarks, I would've uploaded them directly, but it would only let me do it one at a time.