Think Bigger At Key Outdoor Advertising we can taylor a outdoor advertising program to fit your budget and turn your billboard ideas into reality. Key Outdoor, Inc. has been a leader in the Ilinois billboard industry for over 30 years. Our experience, professionalism and market knowledge keep bringing our customers back. We get your message out to your potential customers 24 hours a day and 7 days a week. Call us today to see how we can help you increase your business.