Table: radio_stations_59
Columns: call_sign
frequency_mhz
city_of_license
erp_w
class
fcc_info

Question: If the call sign is w291ch what's the ERP W corresponding to that sign?
SQL: SELECT "erp_w" FROM radio_stations_59 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 radio_stations_59 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 radio_stations_59 WHERE "city_of_license" = 'great barrington, massachusetts'