RAF bomber crews flying over Germany often believed planes they saw being shot down in the dark were "scare shells" that simulated a plane being shot down. This myth and a couple others seemed to help with morale.
Radar tracking of aircraft was an emerging technology at the start of World War II and the United Kingdom and Nazi Germany had adopted different variations. So despite the obvious antenna masts of the Chain Home stations and German efforts to gain intelligence on British radar the Nazi badly under estimated the capability of British radar leading up to the Battle of Britian.
