Doesn't make sense.

There are countless reports of our radar picking up UFO's, yet the whole point of the stealth bomber is to be radar invisible.

Just the fact that this airplane flew out of area 51 is reason enough to believe that the technology it uses could be extra-terrestrial. As far as I know, america is the only country that has a stealth bomber as advanced as the B-2, and its been around for almost 20 years. Its main build and engineering are classified information, more proof that their could be technology on that plane that shouldn't be their.

With something this advanced coming out 20 years ago, who knows what kind of crazy things they are developping or have developped at area 51. I don't think many other new craft have flown out of their in recent years, and my gut speculation tells me this could be due to the fact that the technology is so advanced that to reveal it would be proof that we have alien technology. Another reason why we haven't seen any, is that they have been flying them around, but are keeping it secret, hence all the crazy triangular and other UFO sightings that are so common in the US.