Dayton, OH area...Class As like WROU (92.1), WDKF (94.5) and WXEG (103.9) get to about the Indiana border to the west and Springfield to the East, Sidney tops to the north (WROU fights whatever WZOQ is now out of Wapakoneta around there. To the south about Middletown or Waynesville. Haven't DXed these stations outside their normal areas, all suffer from out of town interference not too far out.
The grandaddy of Dayton FMs, WHKO (99.1), goes to east of Indianapolis at times, north to just south of Lima and I've heard them in Columbus as well as past Cincinnati. I've DXed WHKO north of Lafayette, IN.
The other Dayton-based FMs, WTUE (104.7), WMMX (107.7), and WLQT (99.9) go to about Sidney with strong signals and weakly to Lima and Celina. I pulled WMMX once in Ft. Wayne (before 107.9 signed on there).All go east to about London.OH. Rimshots: 102.9 WDHT goes to Columbus and beyond to the east (tower is in Springfield), Lima and even sometimes Ft. Wayne to the north but is clipped to the south by WEBN. I have listened to 102.9 almost full queiting on I-465 in Indianapolis, and before WNJY (now WXXB) signed on, it wasn't unheard of to hear them in Lafayette. 95.7, WHIO-FM, Findlay to North of Cincy, and I've heard them on I-71 north of Columbus as well. I have heard them on US421 north of Indianapolis. 92.9 WGTZ (Eaton) west to about Rt. 3 oln I-70 before they get wiped out by 93.1 WIBC, north to a little past Sidney. Celina area I would hear either them or South Bend. I'm not sure but I may have heard them weakly on the Lake Erie shoreline. They get clipped to the south by Lexington.
106.5 in Greenville (WDSJ) really gets out. They're a local in Celina and I've gotten them to Indianapolis to the west and before 106.5 signed on in Chillicothe, even weakly in Waverly, OH 95.3 in Xenia? Never heard them out of the area...Piqua's about as far north.