The cloaking as Lazar described it is a byproduct of the anti gravity which is why the naked eye can’t see it. The gravity field around the craft distorts the area around it, which is why only infrared vision can see it.

True story: my friend’s friend was a fire captain for the San Bernardino FD, said that when they were all gathered together for the briefing after the San Bernardino terrorist shooting, “something came and hovered over the group.” He looked up and saw nothing but sky but KNEW that something was above them. He said “something was there, but wasn’t there.” That’s all he could describe what he saw, felt, and heard.

This could very well be a government observe and recon technology.