Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the ERP W number where the frequency is smaller than 91.1?

### Inputs:
table_name: table, columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']

### Response:
SELECT MAX ERP W FROM table WHERE Frequency MHz < 91.1