I don';t nthink WZQK could really go up in power without adding more towers.
980 WAKK McComb and 960 WABG Greenwood are the nearest co-channels, and while they're over 60 miles away.... certain millivolt contours of stations on the same or nearby channels can't cross and if 970 in Brandon wanted to have a crystal clear signal where you'd notice a difference,m they'd have to go to at least 4KW and that would cause prohibitive overlap with 960 and 980 if they didn't directionalize it anymore...
However, WZQk could add a 3rd nor 4th otwer and beam a signal into Jackson, I guess...