Private UFO Film: 

“Unidentified flying object over Duncanville.”

(CriticalPast.com, Reston, Virginia)

The UFO was filmed over Duncanville, Texas on 12 December 1957:

http://www.criticalpast.com/video/65675039969_unidentified-flying-object_Unidentified-Flying-Object_night_ufo

“Duncanville, Texas” (City-Data.com):

http://www.city-data.com/city/Duncanville-Texas.html

Satellite photo of Duncanville, Texas (city-data.com)

(city-data.com photo)