I've heard CHAM a few times in the Chicago area. On (the relatively rare) nights when CKOC is solidly on top on 1150, sister station CHAM will sometimes be in the mix under WBAP on 820. In northern Wisconsin and in Minnesota, CHAM is an easier catch....semi regular with or under WBAP.
"Back in the day", I've also snagged it in the Chicago area when it was on 1280....including during its former life as CJJD.