1530/WCKY is non-directional days, and switches to a directional antenna at local sunset in Sacramento California. The reason they go directional, is to protect another AM station, KFBK/Sacramento, which is also a 50,000 watts.
Most stations required to switch to directional at night do so at their own local sunset. WCKY is a rare exception, staying on past Cincinnati local sunset.
WCKY's night time pattern looks like this.
At night, the actual coverage area is far greater than shown. This represents local-like coverage (red), and reliable near local (purple). I have found that the real local and reliable areas can be up to 25% less that this website indicates.
Daytime looks like this. (25% less than shown) Between purple an blue is "fringe" reception.
Day an night, AM stations signals are carried by a "groundwave", and the lower the frequency, the better the signal travels. That means if 55/WKRC were non directional, their 5,000 watt signal would travel much further than WCKY's 50,000 watt signal on 1530.
At night AM Signals are also reflected off the ionosphere, allowing the signals to travel great distances. Opposite of daytime, the higher the frequency the greater the distance traveled.
AM is also affected by ground conductivity and obstructions such as downtown's and mountains.
As to a dedicated local station for UC sports. Ain't gonna happen. The revenue stream cannot be generated to make a "WCRD" type station viable. Unless UC wants to purchase time, generate its own programming plus solicit advertising for their time spot. That might work. For all I know, UL may have a similar deal going at 790/WCRD.
I probably lost you in the first sentence
, but I don't care.