American Gangster - Cellular Antenna
At the beginning of the movie "Bumpy" Johnson is tossing out turkeys to the crowd on the street. The next segment shows a train rolling down the tracks. The building on the right of the screen (red and white lettering) clearly shows cellular telephone antenna just above the lettering. They look like long rectangular boxes attached to the building. I'm fairly sure cell phones were not available in 1968-1970.