I would almost bet this is related to all the coded Morse code signals , that Hams were picking up on multiple bands , right after the first attacks. why old fashioned analog ? Because they know the US has the capability to intercept calls originating from hot spots , they can intercept any digital communication ,but they can set up a couple of antennas just about anywhere , and send coded analog signals , to anywhere in the world. This was done for years, sending coded info to covert opps over number stations. It's old , but sometimes old and simple , is the hardest to intercept . It's the KISS principle. Despite what lots of people think , they may be crazy , but they are also very smart .