CREATE TABLE table_75078 ("Callsign" CLOB, "Area served" CLOB, "Frequency" CLOB, "Band" CLOB, "Fate" CLOB, "Freq currently" CLOB, "Purpose" CLOB)

Which area served has a Callsign of 5ddn?
SELECT "Area served" FROM table_75078 WHERE "Callsign" = '5ddn'
SELECT "Area served" FROM "table_75078" WHERE "Callsign" = '5ddn'