I'm told that these frequencies are used by the branch of the postal service that investigates fraud and provides armed protection to postal workers in high-crime areas. You might hear something interesting around the first of the month.
| USPS Frequencies |
|---|
| 413.600 | 413.700 | 414.750 | 414.975 | 415.050 |
| 415.150 | 415.950 | 416.075 | 416.225 | 418.300 |