IIRC, I think continuous wave radar (CW) can defeat stealth to the point where you could light them up like it was day. I remember reading about that in the 1990’s. Come to think of it, CW radar was used as far back as the 1930’s and 1940’s, most notably in the British “Chain Home” system. Attacking Syria is a lose/lose proposition, I would hate to be the chump(s) who would have to fly an F-15 or worse, a B-52 over Damascus, it would make flying over Hanoi look like a picnic. I have an old (1981) “Elementary Electronics” magazine article somewhere about how the F-15’s avionics measure up on the battlefield and it had a writeup on how tough the Syrian defenses were in the 1973 Yom Kippur War. The SA-6 and especially the SA-8’s were very deadly. I’m sure they are still there today along with newer stuff of course. If the Syrians did anything to us, I’d say, “yeah, sure, let’s go get them,” but they haven’t done a thing to us and in a way with Assad, he’s one of the few keeping a lid, or trying to, the radical Islamists. I think this is a way to distract from Bengazi, the economy, Obummercare, etc.
Stealth technology has always been detectable by low band search RADAR. The British publicly announced after Desert Storm that they were able to track F-117s operating out of Saudi Arabia using low band search RADARs aboard ships sailing in the Persian Gulf. Stealth reduces detection range it does not make you invisible.