CREATE TABLE table_39393 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

Which city of license has a frequency less than 100.1?
SELECT "City of license" FROM table_39393 WHERE "Frequency MHz" < '100.1'
SELECT "City of license" FROM "table_39393" WHERE "Frequency MHz" < '100.1'