- In radio communications, an area within the normal range of a transmitter where radio reception is poor or non-existent. May be caused, for instance, by large objects in the vicinity of the receiver. Also called blind spot.
- In a receiver, a section within its tuning range in which reception is poor or non-existent. May be due to poor sensitivity or improper design of the circuitry.
- noun a place where radio reception is poor, even though it is within the normal range of the transmitter