Longman Dictionary of Contemporary English
off-air
adjective
EXAMPLES FROM CORPUS
▪ However you will need to find out about the laws governing off-air recording in the country you are in.
▪ In some cases a single aerial serves a block of flats or a valley area where off-air reception is poor.
▪ The treatment of off-air material outlined in Video Plans 14 and 15 could form the basis for discussion of this kind.
▪ This is one example of a task related to an extract from off-air documentary material within a unit on drugs.