We have three smart meters and all out power pines are underground. No units like that here, I think smart meters communicate over the power lines.
Looks more like a DAS antenna to me, see posts 45 and 57.
We’ve had a smart meter for electric for a couple of years. The power to the house is under ground. The meter sends it’s data via text messages to the power company. The good part is they know immediately if the power goes out in the area. Bad part is they want to bill us at a higher rate for peak times.