That's what I have been asking too. He said he observed it for ten minutes but he never said he taped it for ten minutes. Neither he nor the talking heads at his news station said anything about where in his total tape the footage they aired was clipped from. Although the earliest footage shown shows about half of the eventual total length of the plume and the latest footage shows a degraded contrail with no vehicle in it.
The one part of the video that has a frame of reference for its true speed is where the huey helicopter flies perpendicular to the path of the object.
Where's this from?