[_Jim]

the audience for this station is huge (they are located in Arlington, near Ft Worth

Those would be the studio facilities, the transmitter facilities/tower are in the E/SE quadrant of Tarrant county. At one time, before DFW airport came into being, that was where WBAP's transmitter site was located ...

[Little Pig]

IOW, Arlington. Arlington occupies almost the entire SE quadrant of Tarrant county (according to the county map showing incorporated lines). Link here