CREATE TABLE table_17644 ("Branding" TEXT, "Callsign" TEXT, "Ch. #" TEXT, "Power  ( kW ) " TEXT, "Station Type" TEXT, "Coverage  ( Transmitter site ) " TEXT)

What is the coverage for relay tv-37?
SELECT "Coverage (Transmitter site)" FROM table_17644 WHERE "Station Type" = 'Relay' AND "Ch. #" = 'TV-37'
SELECT "Coverage (Transmitter site)" FROM "table_17644" WHERE "Ch. #" = 'TV-37' AND "Station Type" = 'Relay'