Below is part of the table of the FM classes found in 47CFR73.211 which defines a FM stations maxium ERP and corresponding HAAT. ERP is listed in kilowatts and HAAT is in meters. This table does not include the subtable data for stations licensed in the the Virgin Islands or Puerto Rico as that is beyond the current scope of this site.
| Class | Max ERP | Max HAAT |
|---|---|---|
| A | 6 | 100 |
| B1 | 25 | 100 |
| B | 50 | 150 |
| C | 100 | 600 |
| C0 | 100 | 450 |
| C1 | 100 | 299 |
| C2 | 50 | 150 |
| C3 | 25 | 100 |