CREATE TABLE table_529 ("Branding" CLOB, "Callsign" CLOB, "Frequency" CLOB, "Power  ( kW ) " CLOB, "Location" CLOB)

What was the callsign in Zamboanga?
SELECT "Callsign" FROM table_529 WHERE "Location" = 'Zamboanga'
SELECT "Callsign" FROM "table_529" WHERE "Location" = 'Zamboanga'