CREATE TABLE table_15351 ("Media market name" CLOB, "Callsign" CLOB, "Analog" CLOB, "Digital" CLOB, "Affiliation" CLOB)

what is the callsign for independent affiliation?
SELECT "Callsign" FROM table_15351 WHERE "Affiliation" = 'independent'
SELECT "Callsign" FROM "table_15351" WHERE "Affiliation" = 'independent'