Let's see here, from 30 or so miles west of you (daytime unless otherwise noted)
1150: WISN 24/7. Very tough to pull out of WJJD splatter daytime, but alone on top at night with a fair signal
1220: WKRS (Waukegan, IL). Fair at best. WLPO underneath. Most of WKRS signal goes north. But the null in my direction is less severe than the null to the south. Meanwhile WLPO is oriented east-west, which would seem to explain why they'd be on top for you.
1230: WCLO (Janesville, WI), WJOB underneath
1260: WEKZ (Monroe, WI 1kw ND) weak
1290: WMIL (Milwaukee, 1kw ND) weak
1310: WIBA (Madison, WI) Fair at best 24/7
1320: WILS (Lansing, MI) Fair-Good nights. Blank daytime
1330: WEAW doing battle with WRRR (Rockford, IL) Two signals of fairly equal strength
1340: WJOL (Joliet, IL) weak with an even WRIT (Milwaukee) underneath
1370: WGRY/WLTH Barely audible
1380: WBEL, Beloit, WI (5kw DA-N) fair days, disappeared completely at night....when KWK (St Louis) would take over
1400: WRJN, (Racine, WI.) fair. I'd think this one would be doable at your location
1420: Blank (no WIMS)
1430: WEEF Weak. WCMY, Ottawa, IL sometimes underneath. At night WIRE (Indianapolis) and WIL (St Louis) would duke it out. KELI (Tulsa) would sometimes also surface
1460: WRAC, (500w ND) weak
1480: WGSB, (Geneva, IL 1kw oriented NE-SW) Fair 24/7 (except that they signed off at 10pm). Cubs sportscaster Jack Brickhouse was the owner (well, legally his wife owned it)
1550: WMIR, (Lake Geneva, WI (1kw directional e-w), weak.
1570: WBEE fought it out with WFRL (Freeport, IL). Similar to the "battle of 1330" except involving weaker signals. At night, XERF was fair at best, but usually owned the channel. Sometimes CFOR or CHLO came through or even rose to the top. More commonly CFOR.
1600: WMCW, Harvard, IL 500w ND, fair. No trace of WCGO