Saudis have not turned on the radars near the plants for a long time.
No patriot radars have been active in recent months (at least not consistently) in the vicinity of the plant, not in the short range required to detect low flying cruise missiles or drones. Closest installation is in Barhain. (using Sentinel 1 CSAR sat for detection) pic.twitter.com/1nOvh9hioj
First, updated maps of the air defense sites at Abqaiq. First one is April 2019 (the date of the image), the second is how forces were deployed as of this week.
