Back in the early 1980s, the FCC calculated the power for the PSSAs. Generally, the power depended on the Non-DA or DA pattern, and the proximity of well protected stations, such as I-A, I-B, II-A, II-B, III-A, and III-B. Generally, if the DA-D protected the well protected III-A and III-B stations, they got more power, Non-DA less, and if the DA was directed toward the well protected stations, still less, such as WCLB 950 got only 11 watts to protect WWJ. WFLT 1420 got 142 watts since they already protected WHK quite well with the DA. The stations protecting I-As and I-Bs generally got powers in the 1-5 watt range. WPGR protects I-B WLAC 1510, and WZUM protects I-B CBE(F) 1550.
Generally speaking, the older the station, the lower the NIF is, although there are exceptions. The WWJ and WHK call letters give you a clue about their NIF, without looking I'd say close to 3 mV/m.