Instruments of Darkness Dr Alfred Price
I gave my my stepfather an ex Pathfinder squadron signals leader the above book as Christmas present one year. Not a peep did we get out of him on Christmas day. Mother was becoming all het up as he just sat there totally immersed.......he finally closed it with a thump at about 4pm. 'B....sterds'. 'Who the Luftwaffe I asked?'.' Nay lad our bloody airstaff....'
The book is as gripping as any novel and far better written. Tells you all (or almost all) you need to know about the early days of electronic warfare.
I've collected Dr Prices works ever since.