Original sentence: 1) The control measure by which the National Geographic and Northrop-Grumman teams based their scenario on was the 1940 British Home Chain radar system - even though, by the projected date of a Horten 229 deployment in 1945/6 - this air defence network had been considerably upgraded.14 mobile radar units.2) The National Geographic program showed computer generated reconstructions of the Horten 229s taking on and defeating Supermarine Spitfire Mk.3) The National Geographic's main proposition for Horten 229 penetrating the British air defence system was that the 229 could have crossed the English Channel such high speeds that British fighters could not have responded quickly enough to intercept them.4) Strategically, the destruction of the British 'Home Chain' radar network by the Horten 229s - as proposed in the show - would have been completely futile by 1946 and would have served almost no purposes at all in turning the tide of the war.Addendum: It should be noted that to 'prove' the National Geographic proposition concerning the ability of the Horten 229 to defeat the British air defence network the following facts were omitted from the programs 'experiment':.All in all, the National Geographic scenario - proposed in the television program 'Hitler's Stealth Fighter' - was completely flawed by it's contention that the German Horten Ho229 in 1946 could have defeated a British defence system from 1940.IX fighters, even though - once again - by 1946 British technology would have like-wise have moved on and the fighter the Hortens would have been up against would have likely been the Gloster Meteor or de Havilland Vampire jet fighters.The British radar network by then included both the 'Home Chain Extra Low' - specifically designed to detect low flying German aircraft (as low at 50 feet) and the advanced Mk.This completely overlooks several glaring facts; that in 1944 the Allied were already advancing on mainland Europe itself, that mobile radar units and allied fighters were based in France at this time and that the Royal Navy had picket ships in the English Channel and would have been - in all likelihood by 1946 - armed with the Stooge surface to air missile system.Unless the Germans had also secretly invented time travel as well