As near as I can tell, the beginning of WWII was the also the beginning of the importance of radar. While still in its infancy, it allowed the Royal Air Force to meet the German bombers enroute and drstroy many before they reached England.

What bothered the Germans is that, one day, they were destoyed, the next they were fully operational.

From the beginning, and even now, radar is easily destroyed and easily repaired. I am sure it does cost some to repair a radar system, but far more to destroy.

Many think thay Gemany made a mistake trying tp destroy the radar instead of the air fields. Taking out aircraft on the ground would have had longer lasting affect.

And now Biden errors likewise. I we are spending more to destroy those radar sites than their cost to replace them. It is not very effective.

The only real logical time to take out radar sites is when it will be immediately followed by air strikes on real targets, this do that they will not br able to use their radar for their defense.