| City | Deer River, Minnesota |
|---|---|
| Broadcast area | Iron Range |
| Branding | J105 The Thunder |
| Frequency | 105.5 MHz |
| First air date | 1999 |
| Format | Classic rock |
| ERP | 100,000 watts |
| HAAT | 155 meters |
| Class | C1 |
| Facility ID | 26005 |
| Owner | Lamke Broadcasting |
KBAJ (105.5 FM, "J105 The Thunder") is a classic rock radio station licensed to Deer River, Minnesota and is owned by Lamke Broadcasting.
On January 1, 2017 KBAJ split from its simulcast with KQDS-FM 94.9 Duluth and rebranded as "J105 The Thunder".