Meaning of "running stationary radar down"

I heard this in a true crime show. The whole quote goes like this: (He's a police officer btw)

At approximately 10 pm, I was sitting here running stationary radar down towards the Circle K.

So what was he doing exactly? Was he operating his radar? Why towards that place? I have no idea what he means here.

Stationary radar is otherwise known as a police "speed trap" See How Police Radar Works":

How Police Radar is Used

Two types of radar are used—stationary and moving. Stationary radar must be used from a static site, typically a patrol car parked at roadside, sometimes a motorcycle. The most common type of stationary-mode radar is the hand-held model that looks like an oversized pistol.

Your sentence is parsed: I was sitting here running stationary radar [down towards the Circle K.] where "down towards the Circle K." is an adverbial phrase modifying "running"

down towards the Circle K. = down (i.e. along) the road in the direction of the ranch that is called "the Circle K"