Low, slow flying dark gray rectangle with flashing lights headed north east over I-69

Checking horses before headed in for the night, my 9 year old son began screaming about lights in the sky that were blinking. I went out of the barn and looked up to see a VERY slow and low flying rectangle shaped object. The lights along the bottom were in a line, bright LED white, and illuminating the bottom. Bottom appeared to be dark gray. Husband, a Navy Vet, came out because of the yelling and saw the object as it crossed over our property to the adjacent property and passed by/over a radio tower and continued north east over I-69 and towards Angola and the Indiana/Ohio/Michigan border. 100% WAS NOT STARLINK, we've seen that several times and this was way way way lower, brighter, and had body to it. Husband estimates it was flying at maybe 20,000 feet. The dogs and horses have been EXTREMELY agitated since the sighting, especially the broodmare that has a foal at her side.