Table: radio_stations_nt
Columns: callsign
area_served
frequency
band
freq_currently
purpose

Question: What is the frequency for katherine?
SQL: SELECT "frequency" FROM radio_stations_nt WHERE "area_served" = 'katherine'

Question: Which band has a current freq of 8tab (hpon)?
SQL: SELECT "band" FROM radio_stations_nt WHERE "freq_currently" = '8tab (hpon)'

Question: Which freq currently has 0 657?
SQL: SELECT "freq_currently" FROM radio_stations_nt WHERE "frequency" = '0 657'

Question: What is the purpose for the katherine freq of 8rn?
SQL: SELECT "purpose" FROM radio_stations_nt WHERE "freq_currently" = '8rn' AND "area_served" = 'katherine'

Question: Which freq currently has 0 684?
SQL: SELECT "freq_currently" FROM radio_stations_nt WHERE "frequency" = '0 684'

Question: Which band serves darwin for commercial purpose?
SQL: SELECT "band" FROM radio_stations_nt WHERE "area_served" = 'darwin' AND "purpose" = 'commercial'