The third tower on Hwy 36 is indeed an FM tower. Last I checked, KEYJ, KEAN, and whatever 100.7 is all broadcast from there. I believe (it's been a while since I was up there) that the first tower headed out of town is KTAB/KRBC, the second tower is the FM tower, and the third tower is KXVA.
And, in case anyone is interested (it may have been mentioned here before) the KTXS tower is about 7 miles south of Trent on the hill. Their tower is the taller one, and the shorter one just to the west is where KBCY 99.7 and KHXS 102.7 broadcast from.