Radars uniformly set on high sensitivity. You're looking at the noise floor within [x] miles of the radar. The sudden smaller size of a couple was a manual d

Radars uniformly set on high sensitivity. You're looking at the noise floor within [x] miles of the radar. The sudden smaller size of a couple was a manual dbm adjustment. They seem more common these days, I think because when you saw sharp cutoffs it was usually a threshold cutoff setting some human had to twiddle and humans don't bother anymore. This stuff drives some Boomers crazy and sets them to babbling about HAARP, especially the pacman shapes that represent a metallic obstruction near the center of the radar.