The wattage is not the dictator of the class of station. KXMP is not a low power station per the FCC. The way it works in the 88 to 92FM portion of the band, you can 'fill the hole without interference'. If that is 100 watts at 50 feet and you apply for a non-Low Power FM license, it can be granted. Antenna height above average terrain plus power equals the coverage. I recall looking at a station with a 20 foot tower and 60 watts. The antenna was on a mountain and the coverage was equal to a 6,000 watt FM at 326 feet above average terrain. I remembered thinking I'd like the electric bill each month versus having to produce 6kw into an antenna or multiple antennas. I thought a 60 watt ERP on a mountain would make for a nice solar or wind power driven FM. By the way, there is a 1 watt Low Power FM in Arizona. It is located on a tower on a mountain. Because the height above average terrain is so high, the power is reduced to lessen the coverage so it compares to a Low Power FM of 100 watts at 100 feet above average terrain.