Question: If the call sign is W291CH what's the ERP W corresponding to that sign?
SQL: SELECT "ERP W" FROM "2-1540742-1" WHERE "Call sign" = 'W291CH';

Question: For the call sign W242AT what's the city the license plate is registered to?
SQL: SELECT "City of license" FROM "2-1540742-1" WHERE "Call sign" = 'W242AT';

Question: What's the Class for the city the license plate was issued in Great Barrington, Massachusetts?
SQL: SELECT "Class" FROM "2-1540742-1" WHERE "City of license" = 'Great Barrington, Massachusetts';