Screaming or howling in McHenry County, Illinois

I was walking down my street and heard what sounded like a guy off in the cornfield yelling, approximately 600 feet away. It was sort of a grunting yell, very deep and it echoed through the neighborhood. It sent the hair up on my neck and scared me a little because the only thing between me and the yelling was a row of houses. This is not the first time I've heard what I think might be a Bigfoot in the area. I have heard what seemed to be three of them sort of locating each other the week before Thanksgiving. Again, I was out walking late at night in my neighborhood, around midnight. I heard a fox call at the end of my block but that sound was cut off by what sounded like a woman trying to imitate her from a little further away. Then a few seconds later, a "man" let out a yell about 3 blocks away. This yell was a deep guttural long yell, too long to be a human. It made the hair on my neck stand up and it also echoed through the neighborhood. Not a few seconds later, a faint "howl" came from what sounded like across the lake. By this point, I had gotten back to my porch and entered the house to find all three of my cats wide eyed and standing in the middle of my living room. Out of curiosity, I decided to go sit on my porch to see if the howls continued. The sequence of howls and yells continued on for about 20 minutes. First the "woman", then the "man", then the faint one across the lake until they were far enough away that loud vehicles drowned them out and I went back inside. I wish I'd have thought to use my cellphone camera to record it.