I remember back in the late 90s when Baton Rouge didn't have an alternative station, KLSU picked up the slack. They would play some off-the-wall indie bands, sure, but for the most part they played what 100.7 The Tiger (and let's not forget 107.3 The Tiger) played when they served as Baton Rouge's modern rock station.
On Sunday nights, KLSU had an all-request show, and you could request anything by way of alternative and they would play it. I also remember KLSU would air LSU Baseball games during the week, and WJBO-AM would air the weekend games. I think that stopped after the 1996 season, and then eventually all LSU Baseball games were aired on FM when WDGL-FM took over flagship duties from WJBO-AM.
As far as the signal is concerned, I could pick up KLSU as far east as Albany (Livingston-Tangipahoa parish line) and as far west as Breaux Bridge. KNXX comes in choppy in my old hometown of Walker, so I feel like KLSU has a better signal, at least for Baton Rouge and its surrounding areas.