CREATE TABLE table_28631 ("Channel" FLOAT, "Channel name" CLOB, "Callsign" CLOB, "Signal power" CLOB, "Broadcast area" CLOB)

What is the call sign for channel 6?
SELECT "Callsign" FROM table_28631 WHERE "Channel" = '6'
SELECT "Callsign" FROM "table_28631" WHERE "Channel" = '6'