Richard Fry wrote:
The ghost image needs to be at least 1% of the peak amplitude possible
for the primary video signal before it becomes noticeable So in order
for the 2nd and successive ghosts in my example to be visible to a TV
viewer, the reflection producing the first ghost would be so
objectionable that a TV station would not tolerate it, and fix the problem.

As I remember, the Texas A&M experiment used a reflection
coefficient of 0.707, i.e. 50% of the signal energy was
reflected at the TV receiver. There also had to be considerable
reflections at the source but that fact was never discussed.
--
73, Cecil http://www.w5dxp.com