I have the Echostar version of the DISH 6000 receiver, which is not any different than the JVC version except for the nameplate.
In order to receive OTA digital signals and HDTV transmission, you'll need to purchase the optional 8vsb module, which should slip in an empty panel on the back of the receiver. Installation instructions will be included with the module. You can then scan automtically for all the Chicago stations that broadcast in DTV. The module should set you back $130 to $150 if you shop smartly on the internet.
The stations now broadcasting in DTV include WBBM, WMAQ, WLS, WGN, WTTW, and a few others (Channels 38 and 44) that I don't watch.
Let me qualify about WBBM. Their signal is on and off (mostly off) because they broadcast from VHF channel 3. All others have UHF channel locations and their pictures are generally solid.