Here in Wood Dale, IL in the near NW suburb of Chicago:
Daytime: nothing but splash from WSCR which is just 5 miles away from my location
Nighttime: WFAN
DX/RETRO: the following DX heard on this frequency in the past: KSKY (Balch Springs, TX), KTNN (Window Rock, AZ) with their unique programming, WVAL (Sauk Rapids, MN), WESC (Greenville, SC) and the following foreign catches CMEB (Santa Clara, Cuba), XERPM (Mexico City), XECPR (Felipe Carrillo, Mexico), HRNN (La Ceiba, Honduras), YNALN (Esteli, Nicaragua). The most recent catches on this frequency are WLOY (Rural Retreat, VA) and WXIC Waverly, OH) in 2022. Two additional Mexican stations received in 2022: XEDTL (Mexico City) and XEEY (Aguascalientes). This makes a total of 4 Mexican stations received here in Chicago area on 660 kHz.