CISO-FM
| Broadcast area | Simcoe County |
|---|---|
| Frequency | 89.1 MHz (FM) |
| Branding | 89.1 Max FM |
| Programming | |
| Language | English |
| Format | Modern rock |
| Ownership | |
| Owner | Bayshore Broadcasting |
| CHGB-FM | |
| History | |
First air date | Late 2010 |
| Technical information | |
| Class | A |
| ERP | 2.5 kWs |
| HAAT | 154.1 meters (506 ft) |
| Links | |
| Webcast | Listen Live |
| Website | 891maxfm.ca |
CISO-FM is a Canadian radio station, which broadcasts a modern rock format at 89.1 MHz in Orillia, Ontario. The station is branded as 89.1 Max FM.