Don't even dream of Arrows, Patriots or any other anit-missle systems. They may be effective against one or two missles, but not against a swarm. There is only one defense against hundreds of Iranian missles tipped with chemical and biological warheads. AND THAT IS A CREDIBLE PROMISE BY ISRAEL THAT ANY SUCH WMD ATTACK WILL RESULT IN THE NUCLEAR DESTRUCTION OF IRANIAN CIVILIZATION. BUT NOTE! If such a threat works, then Mutually Assured Destruction, a strategy that has so far deterred the big powers from trying to obliterate each other, may also work for nuclear Israel and nuclear Iran. The only other alternative is to preempt Iran in such a way where it is incapable of launching any WMDs at Israel and the Gulf states and in shutting down the straits of Hermuz. And that train, I believe, has left the station. Iran is too well armed by now for total preemption, even with US fleets' help, to work. These are the realities, the rest is wishful thinking.
Rocket alarm sirens sound in southern Israel (Haaretz)
from the article: Preparing for the military option