Not being from San Antonio I don't know what CPS is.
Was this an electric utility truck?
If so, the antenna might be a for an impulse noise receiver for locating faulty power line hardware.
Several years ago I had something making line noise in my neighborhood that wiped out HF and some of my over the air TV channels.
I called the electric company and they sent an engineer out with a hand held wide band noise receiver with a LP antenna. I watched him point it around and found the noise was coming from a damaged arcing insulator on the primary in my back yard.
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Tom
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