That span is the total allowable space in the FCC part 15 rules for 5 GHz gear, where the AF5/5X has been tested and certified. Other radios can be used from 5200 to 5850 MHz (DFS frequencies permitting).

But the size of the channels it can operate in are 5, 10, 15, 20, 30, 40, 60 or 80 MHz wide. Software configurable on the radio.