It´s in the article how big a target must be.
There are so many other factors involved. Each factor shortens each type of radars range. For instance, the F-35 is not invisible. You can track him at a decent range or at lest be aware he is there. But the lock radar range is severely curtailed to about 35 miles. This is why the Russians have interceptor aircraft stationed near their S-300 and S-400 sites to go have a closer look see.
Prove it is 35 miles. Why should an air defense system have a range of 150 miles then? Prove it. Post a source, get an evidence or keep this nonsense down. KEEP IT DOWN.
Easy answer to someone with at least an ounce of sense. There are considerations that change the range of detection.
- Junk in the air returns radar. Meaning, even a clear day has impurities in the air. This goes on until there isn't enough signal to return.
- Size of target. The smaller the target, the more the atmospheric disturbance affects your radar return
- Counter messures. Including shape, covering, etc. The F-117 used a completely different method of stealth just by it's shape just by redirecting the radar at odd angles away from it's source.
- Curvature of the Earth. Believe it or not, Radar can't see through the earth unless it's VLF. And true VLF radars require HUGE arrays or extremely long antennae. Your maximum range is direct line of site under ideal conditions.
So, if you have a 170 mile range due to line of site, and all the other items contribute, your maximum range lessens by many degrees. What the F-35 and the F-22 bring to the table is all the other atributes without considering the curvature of the earth. But that last factor is available to them if they need it. Search for him and he will know it. Try to do a lock and he will know it. Get a lock and he will know it. Even after you fire your missile, you have to maintain a good lock until the missile is close enough to maintain the lock by itself. This is why most missiles will miss the F-35 and F-22. There are just too many variables that have to be right to actually hit the target. If any of the variables fail then the missile will go ballistic and land in some field or housing section as a dud.