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 I researched more into why the fire department’s Radios were having difficulties and issues, especially on the higher floors. First, the agency primarily used VHF (very high frequency) radios which are better for long distance when there is line-of-sight form point-to-point with minimal obstructions. UHF operates on a higher frequency and thus transmits with shorter wave-lengths which is better for object penetration. There are many challenges with radio communications in a city like NYC, starting with the sheer fact that to transmit directly from the ground to the top requires going through over a hundred stories of steel and concrete.

The repeaters worked to an extent. We know that they were operational and working, at least partly, as they recorded the relayed transmissions. The police used a separate but almost identical repeater as the fire department with mostly success. The NYFD experienced more issues. I found reports that claimed from fire fighters in the towers that while the transmissions were getting through, they were not understood due to the loud working environment and congested radio traffic.

The Incident Command System was largely ineffective. The only agency that was properly trained in ICS was the fire department which made inter-agency command and control through ICS moot. It was because of the events on 9/11/2001 that resulted in the development of the Nation Incident Management System, by the Department of Homeland Security, which encompasses ICS and more. Federal funding for emergencies now requires that NIMS be used as well as all first responders that respond to hazardous materials incidents be trained in the ICS.