My company has an AMDR program. Gee, if I had known it was being tested in Hawaii, I would have tried to get on it. It sounds like a monostatic (vs. multistatic) radar and it sounds like it employs S- and X-Band (Aegis and THAAD) or similar traditional radar bands. What defeats stealth is long wavelength (ROTHR) or multistatic radars. There are very few multistatic radars (SPACE FENCE) and only a few long wavelength radars.
The ROTHR receive array is almost a mile long and not particularly suitable for a shipborne system, although ROTHR based in Virginia, Texas and Puerto Rico maintain constant surveillance on the Carribean and send reports to ships in the area. (Drug interdiction mission.) The advantage of ROTHR in this mission is cost per square mile surveilled. ROTHR also operates in a bistatic mode, though this mode is used to avoid second time clutter rather than for enhanced RCS.
SPACE FENCE is unique in that it is not only multistatic, it is also the only CW radar I know of, other than hand held Doppler machines (baseball and police speed guns). Again SPACE FENCE is multistatic for reasons of geometry, no RCS enhancement. The Serbs putatively used an improvised multistatic radar to shoot down an F-117 during the Kosovo War. I've also heard they used longwave radar. In either case, I don't think they fielded robust systems, rather they relied on U.S. operational sloppiness and lack of electronic support measures, such as jamming.
How about set up as an array with part of the system on each of several ships strung out in a line?
I heard the Chinese and Russians are experimenting with doppler systems. They’re a bit frightened of what we’ve got.