Quora: Won't the Patriot missile batteries in Ukraine become easy targets for the Russians?
"Because there's nothing easy about killing a very sophisticated weapon system designed specifically to deal with this exact threat."Even if Russia knows exactly where they are, they have to attack with weapons the Patriots are designed to shoot down. If Russia engages the Patriot batteries, then Russia is not targeting Ukrainian cities. The Patriots are "bomb magnets" if they can be found, except Russian cruise missile targeting is slower than the Patriots ability to move around. The batteries are further protected by rings of other short range air defenses, AA guns and MANPADS."They are designed specifically to shoot down the very types of missiles and aircraft that the Russians would have to use to attack them, and they are very good at it, so the missiles and/or aircraft are unlikely to get through."
For all Russia has thrown at the Patriots, all they did was give one part of one system down time for less than a day. Then Russia claimed to destroy more Patriot systems than Ukraine has.
Obviously both sides can use satellite data to try to identify radar locations.