From: Washington D.C.
Those results are likely dependent on the radars and jamming systems involved as well.
Here's the interesting thing: If the jet can get as close as 40NM without being detected, what does a combination of medium, low-altitude flight and terrain masking do for you? If they're not going to detect me at 40NM no matter what, then I might as well pick an altitude where their radar horizon is no greater than 40NM in order to minimize their OODA loop. It's all about making the hole wide enough for the bomb trucks to slide through.
I conducted a little test tonight. I only used the B-2 for now, and I pitted it against various Russian and Chinese radar units.
Basically, the radar units start to get a whiff of the B-2 a around 40 nm. They will then go long periods of time (minutes) without getting any more updates.
If you attach an OECM unit to fly with the B-2, then the enemy doesn't start to get a whiff of the B-2 until about 30 nm out.
At around 20 nm, the radar unit should have an accurate bearing, altitude and speed of the B-2.
The biggest threat seems to be if SAMs (with cameras) are present.
The SAM cameras can identify the plane, first as a bomber, and later as a B-2.
If the SAM camera isn't present, then the radar will likely get a bearing, altitude, and range, but it will be intermittent.
The various SAM units have very little chance of getting a shot off, especially if the OECM plane is present, unless they are able to do so using the camera for guidance. Otherwise, it constantly states that it can't illuminate the target.
I did not use any S-400 or S-300 systems. I wanted to keep it very simple.
If the SAM can ever get a fix on the B-2, which really means if it can get close enough to track with the camera, then it will fire.
The the SAM units fire, then the plane is as dead as any other plane. The stealth advantage is gone.
Depending on the radar, you can fly around it or under it in some cases, and that should be enough to keep the SAMs from being able to fire. As I said, it isn't so much the radar as it is the camera on the SAMs that does the work. But, the SAMs wouldn't be activating their camera if the radar unit didn't first get a whiff of the plane.
Tactical maneuvering, and longer-ranged ASM can possible keep the B-2 from being shot at.
As the B-2 turns for home, after it has delivered its ordinance, it is the most identifiable. Rather than conducting the paperclip U-turn, it seems that it is better for the B-2 to continue to fly straight over the target, and get further away from the enemy radars and SAMs before turning for home. The radars are very good when an aspect change is made. So, the B-2 should change course only after it is a distance away.