More interesting, maybe, is the Directv web site giving directions (altitude and azimuth) to point the antennas. The dishes are very directional, giving confirmation that they are pointing at the satellite. The satellites are geosynchronous, meaning they are stationary at a spot over the equator. If you take the directions given for Corpus Christi, Kansas City, and Grand Forks, the vertical component does not match when plotted on FE. On RE, the lines cross at the same point.

There are ham radio guys who regularly talk by bouncing off a satellite, in fact there have been multiple ham satellites launched. Youtube has many videos of hams doing this.

Ham radio operators also aim their antennas to talk with someone far away. You have to know accurately the shape of the earth to know this. Before the internet, hams used to pay money for a flay map with accurate directions everywhere (but not distances, and only from their location) to make it easy to see where to point their antenna.

I would like to see a FE go to a ham radio club meeting and tell them FE.

Youtube has videos of people listening (with very directional antennas) to satellites on home made radio rigs. You can download a program to show the locations of satellites, you can buy (fairly cheap) a usb receiver, make your own antenna, and download gps software from github. You can read the program to see what it really does and examine data from satellites.

If I knew the earth was flat, I would prove it multiple ways very quickly and spread the word. There is a simple explanation for why FE can't do that.

Interesting. I don't know enough to have an answer for that. Anyone?