It's KSEV. Although both Radio-Locator and the FCC database indicate three towers, Google Earth satellite pictures show four towers.
Perhaps the 4th tower is not part of the actual KSEV array, or maybe only two of the towers are used both day and night, while the other two are just for one or the other, so that three are in use at any given time...just not the same three. Just a guess, you'd have to dig into the technical specifics to be sure.
The Google Earth image is a little weird, as the shadow on the SW tower doesn't match the other three, so obviously taken at slightly different times or angles.