If it was an audible sound and not a side effect we felt, anyone around could hear it for a mile. Sounded like feedback from a amp like very low and resonating. It was a residential neighborhood. There were no reports and we didn't want to sound crazy calling Richardson parks asking if they had seen a ufo???. We told our family. We were kinda frozen and stunned. I didn't even have internet in my house in '93 and didn't know about mufon or anyone to report it too other than my parents. I was scared. I was just out of highschool. My mom believed me instantly. Yesterday there was an article about the lady who heads up newzealands ufo research and her sighting sounded just like mine other than she thinks she may have been abducted. I'll get the link.