CREATE TABLE table_28308 ("Branding" CLOB, "Callsign" CLOB, "Frequency" CLOB, "Power  ( kW ) " CLOB, "Location" CLOB)

What frequency is dxec-fm?
SELECT "Frequency" FROM table_28308 WHERE "Callsign" = 'DXEC-FM'
SELECT "Frequency" FROM "table_28308" WHERE "Callsign" = 'DXEC-FM'