CREATE TABLE table_8143 ("Branding" TEXT, "Callsign" TEXT, "Ch. #" TEXT, "Power  ( kW ) " TEXT, "Station Type" TEXT, "Coverage  ( Transmitter site ) " TEXT)

What is Coverage (Transmitter Site), when Power (kW) is '10kW', and when Callsign is 'DYFX-TV'?
SELECT "Coverage (Transmitter site)" FROM table_8143 WHERE "Power (kW)" = '10kw' AND "Callsign" = 'dyfx-tv'
SELECT "Coverage (Transmitter site)" FROM "table_8143" WHERE "Callsign" = 'dyfx-tv' AND "Power (kW)" = '10kw'