They are persons with the foot on EARTH, no alliens in the AIR (in all the acceptations of the word) who visit us with his "amazing gadgets". From my short vision analisis, all the non-well instruments are gadgets.
Also, I think is unequal to compare a spot in the sky (the UFO?) with the physical "gadgets" I show here.
Do you believe that the astronauts visit the Moon? Where is the evidence? Photos? Films? Voices? Do you are present for to confirm is real? My advantage is this: I was present many times during long range detection.
Long range metal detector is not a perfect technology, such as is no perfect metal detector.
My old question: Is more easy to put a man in the Moon (384,000 km) than detect —not at distance— a only coin at 1 m depth?
Something fails.
THE METAL DETECTOR RADAR REDISCOVERED (AT VERY LOW COST):
In internet can to find a radar for detect metals (INFORMATIVE, read all the PDF) in:
http://www.llnl.gov/IPandC/technolog...adar/index.php