user: Question: Which city did KPNZ-TV provide coverage for?
Columns: ['Branding', 'Callsign', 'Channel', 'Power (kW)', 'Coverage']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Estrella TV 40', 'WESV-LD', 'TV-40', '10kW', 'Chicago, Illinois']
SQL:

assistant: SELECT "Coverage" FROM "Table" WHERE "Callsign" = 'KPNZ-TV';