I looked for videos, some for 4 miles, I found none for 8 . The flaw in it is that they are standing up on the shore on both the transmitting and observing post. The additional height accounts for the discrepancy they observe. The test case they chose was marginal to begin with. It should be dry air, at night to minimize some complicating atmospheric effects. There aren't any good reasons to use such a marginal distance either. Lighthouses are very low power combined with a Fresnal lens and can be seen for 40-50 miles. No excuse. I think this should be considered conclusively debunked until and unless an experiment of this class is conducted and verified. Clearly we aren't dealing with a group of people who are well versed in science or the combined manhours spent watching and producing videos (probably in the millions) would have resulted in some proponent spending a day to conduct an experiment that can be taken seriously. It's not rocket science after all.