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Answer for the clue "The property of a microphone or antenna of being more sensitive in one direction than in another", 11 letters:
directivity

Word definitions for directivity in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
directivity \directivity\ n. the property of a microphone or antenna of being more sensitive to sounds coming from one direction than from another. Syn: directionality.

Wiktionary Word definitions in Wiktionary
n. (context geology English) The effect of earthquake motion propagation being greater in the direction of the rupture

WordNet Word definitions in WordNet
n. the property of a microphone or antenna of being more sensitive in one direction than in another [syn: directionality ]

Wikipedia Word definitions in Wikipedia
In electromagnetics , directivity is a figure of merit , usually for an antenna . It measures the power density the antenna radiates in the direction of its strongest emission, versus the power density radiated by an ideal isotropic radiator (which emits...

Usage examples of directivity.

There was a lot of fog have painted a radar picture with a directivity factor of swirling about this situation: different agendas by the four over six hundred million for a two-centimeter wavelength.