Airsoft field near Champaign, IL or Urbana, IL? zip = 61820?

I'm looking for an airsoft field near Champaign, IL or Urbana, IL. My zipcode is 61820. I go to school at University of Illinois at Urbana-Champaign, so I'll be there for most of the year. It's fine if the field is about an hour away, give or take. Just any fields in the area would be nice. Thank you.