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They’re wrong, which isn’t that surprising for television. The 229 is based on the earlier [Horten IV](http://en.m.wikipedia.org/wiki/Horten_H.IV) glider. Both were shaped the way they were to reduce drag and therefore extend range, nothing more.
It would have been harder to detect than conventional all-metal aircraft, but no more so than wooden planes like the Dr Havilland Mosquito. Both were highly visible to modern radar of the day. IIRC the radar test that Northrop did confirmed that it only had a cross section 1/3 less than a conventional design of a similar size.
I’ve seen the existing fragment of the last prototype before the Smithsonian pulled it for restoration. It’s *tiny* compared to nearby German aircraft on display. Given its size, that lower radar cross section isn’t too unusual. Its design did contribute to that somewhat, but I maintain that was both:
* Not very significant
Edit: let me add something. Germany did not have problems with Allied radar. At the time the 229 was being developed they already possessed the virtually uninterceptable Ar 234 jet bomber and the completely uninterceptable V2 rocket.
Their problem was that neither had a very long range. The Horten, with its low drag design, was meant to remedy that.