From wcpt850.com:

"WCPT is moving three steps to the left. Instead of broadcasting at 850-AM, we are moving to 820-AM. While that might be three small steps on the radio dial, it’s going to be one giant leap for Progressives all over Northern Illinois, Southern Wisconsin and Northwest Indiana.

Our new signal at 820-AM will literally double our coverage area. Instead of broadcasting at 2,500 watts from Crystal Lake Illinois, our new transmitter moves 40 miles right to the heart of Chicago, giving us twice the power for all the people! In fact, WCPT’s new 5,000 watt daytime signal will be the best signal of any major AM station in Chicago. Yes, I did say daytime because the 820-AM signal is also licensed by the FCC to sign-on at sunrise and sign-off at sunset. For those with questions on the FCC’s daytime radio rules, please go to the “About WCPT” section of this website. Although we would love to broadcast all day and all night, the new WCPT at 820-AM will now be heard from as far north as Milwaukee to as far south as Kankakee. It will finally put us on a level playing field with the rest of Chicago’s talk radio stations; just in time for the 2008 election season.

Thanks to each and every WCPT listener for being so loyal to the station and helping us take this very important step. Like Johnny Appleseed, you have helped us by spreading the word on our station. I am especially thankful to the people who live in areas where our signal at 850-AM has (to say the least) not been very strong. Your ability to withstand radio noise will now be rewarded with a static-free signal beginning on Monday, November 26th. It’s our way of extending the Thanksgiving weekend an extra day"