user: Question: What is K275AV call sign's highest erp w?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text']
Sample row: ['K272AX', 102.3, 'Garden City, Utah', 30.0, 'FCC']
SQL:

assistant: SELECT MAX("ERP W") FROM "Table" WHERE "Call sign" = 'K275AV';