Many flycatchers like wires too. It provides them with visibility and a perch to "snatch" insects that fly by. They'll sit on telephone wires, but also fence posts and barbed wires.
The Scissor Tailed Flycatcher is no exception. The STF prefers open country such as ranches, farms, or desert grasslands with scattered trees. It's range is essentially Texas in the summer and the tropics in the winter with occasional reaches into Southern Arizona during those summer months. It can be more easily found along the road where there are telephone poles/lines and fences.
|Scissor Tailed Flycatcher on Fence Post|