The problems with the radios were well-known; it's not a mystery. There were also major problems, well known, with the radio repeaters in the towers. Rudy is GREAT at PR, but look at his record: he puts command center in WTC despite advice not to; he recommends a corrupt buddy to be first head of Homeland Security; he yammers about 9/11 while covering up his own inaction beforehand, when it could have helped.