radio silence
Pronunciation:
/ˈɹeɪ.di.əʊ ˌsaɪ.ləns//ˈɹeɪ.di.oʊ ˌsaɪ.ləns/noun
Definitions
A status maintained where all fixed or mobile radio stations in an area stop transmitting (sometimes limited to certain frequency bands).
The period of time during which this status exists.
A period of time during which nothing is heard from a person or organization, especially when such communication would normally be expected.