Thanks for submitting this. I find the technology developed during WW2 to be quite advanced for the time, as I guess most secret/military technology is. When t

Thanks for submitting this. I find the technology developed during WW2 to be quite advanced for the time, as I guess most secret/military technology is. When the Allies discovered the Germans attacking based on beams, they would either attempt to bend them or send in an attack following the beam back to transmitter. With the use of 'Gee', until there were transmitters within France, the Germans would jam the signal such that shortly after crossing the French coast, the signal was obscured in what they described as 'grass' along the bottom of the signal trace. Navigators would also take star shots outside of Gee range. Quite a few of the transmitter sites, chosen for their geography, are still in use for similar purposes today. The development of H2S the ground mapping radar and also utilizing any radar return before it hit the ground gave them 'fishpond' which would display a return for an aircraft that was below them. That could either be another bomber in the stream or a night fighter coming in for an attack.