This Sunday is the Chicago Marathon Frequences to keep an ear on, CPD CW 6, CW7, and the zones. For CFD Fire Main, Fire Engelwood,EMS north, EMS south, EMS comand. Also the A-beep sears 2 UHF trunked system as this has been used in years past. With highs forcasted to be in upper 70's and lower 80's these might get very busey very fast. To any CPD,CFD, and supior ambulance personall working this event, just pray that all hell dosen't break lose like four years ago. Although I have a sicking sense of deja vu, we can only hope that this dose not become the "Chicago heat-a-thon." Please feel free to make additional comments.