It was. Supposedly, that was picked up by a scanner, an independent receiver of radio. The StingRay devices are different. They get data about phones without the owner making a call.
The Gingrich calls were made by an old, retired lib couple, using very rudimentary gear, as they drove in their pickeup behind Gingrich as he rode in the back of a DC limo:
What more would an actor at the STATE LEVEL be capable of..?
I shudder merely to contemplate it.