CREATE TABLE table_5963 ("Callsign" TEXT, "Area served" TEXT, "Frequency" TEXT, "Band" TEXT, "On-air ID" TEXT, "Purpose" TEXT)

Frequency of 100.1 has what on-air id?
SELECT "On-air ID" FROM table_5963 WHERE "Frequency" = '100.1'
SELECT "On-air ID" FROM "table_5963" WHERE "Frequency" = '100.1'