> Important to note - it's highly unlikely that any group of people will be able to establish a coordinated attack on 20 major metros. That level of conspiracy

> Important to note - it's highly unlikely that any group of people will be able to establish a coordinated attack on 20 major metros. That level of conspiracy would be stopped by the time planning got to the 3-5 city attack. It's trivial to do. Make a bunch of jammers on timers, and plant them around dozens of major cities at your leisure. One disaffected person working alone could do it. P.S. Magnetrons are tunable by simply changing the magnets, and microwave ovens can be had for $20 apiece if you buy in large quantity. It does not cost $650 to make a very powerful jammer.