This is the front cover of a glossy magazine which HMS Collingwood put out every QUARTER as the "NAVAL RADIO REVIEW".  It was confidential and was given the identity of CB [Confidential Book] 3158. This edition is Vol 1 No 1 dated March 1947.

The following file contains an article from this magazine which tells of the situation post WW2 in 1947, and what is to come in the foreseeable future.