Re: Back to that drone. On BBC Iran says it electronically hijacked and landed it.
It's still too early to properly speculate, not all the facts are out yet, and may not be for years.
Regarding your last comments, it isn't necessary to be able to duplicate or even fully understand an advanced technology to be able to deduce how it works, and thereby, devise countermeasures to it.
Stealth designs are not foolproof. This isn't the first time we've lost one, the Serbs shot one down, we left a chopper behind when we nailed Bin Ladin. There have probably been others. And yes, even if the patriots are always quick to point out these were mere happenstance, that is the nature of war, isn't it?
As LCDR Spock, UFPSF, once remarked about another stealth technology, "Military Secrets are the most fleeting of all."