In the old days (pre 1961) 1550 Huntsville was there (WHBS, then WAAY), as was Shreveport (back then it was KENT, later KOKA). FCC changed policy on the freq, and began accepting apps ... Birmingham asked for a new 50 kw DA-D; 1570 Selma asked to move to 1550; Mobile asked for a new 50 kw DA-D (NW by SE figure 8 -- the NW lobe aimed right at Jackson); Baton Rouge asked for new 5 kw D; Senatobia asked for 5 kw D; Jackson asked for 50 kw/10kw DA-2 moving to 1550 from 1590. And Shreveport asked for increase from 1 kw to 10 kw Day (500 nite). A lot of this was mutually-exclusive. They all got together and agreed to accept each other's interference, FCC granted 'em all and sat back to see who would build the CPs. Selma never made the move, Birmingham was never built (sandwiched between Huntsville and Selma it was doomed).
WOKJ had a severe null down US 49 to the SE ... you could hear Mobile past Mendenhall, and the other nulls were pretty deep too.
That map shown in the Bcstg Yrbook is exaggerated, as was one the station (under original owner John McLendon) put out - it was free-handed. The Rodens bought the station when McL died, and continued using the coverage map. We (owners of WKXI) had a consulting engineer draw the actual one (complete with interference inside the 0.5 mv/m which would ordinarily be interference-free), and overlaid it on the McLendon one - submitted it to the FCC, and the Rodens had to stop using it.
WOKJ used to put out a night coverage map which showed no contours, but instead highlighted counties - in Miss, Ala, Ga, Ark, Okla - where they had gotten listener mail. Often wondered if one piece of mail in a 5 year period qualified a particular county.