CREATE TABLE table_19098 ("Call sign" CLOB, "Analog channel" CLOB, "Digital channel" CLOB, "Virtual channel" CLOB, "Network" CLOB, "Station Ownership" CLOB)

What is channel 33.7's official call sign?
SELECT "Call sign" FROM table_19098 WHERE "Virtual channel" = '33.7'
SELECT "Call sign" FROM "table_19098" WHERE "Virtual channel" = '33.7'