"Radius of the interacting object" was poorly worded. I was referring to the radius of the interaction itself, which is much smaller than the extent of the corr

"Radius of the interacting object" was poorly worded. I was referring to the radius of the interaction itself, which is much smaller than the extent of the corresponding wave. For example in the double slit experiment, the interaction occurs on a detector screen in a single, small location with a radius on the order of 10^-15 meters (subatomic), whereas before it interacts with the screen, the wave extends throughout the experimental apparatus.