Why are band e microwaves not suitable for communications?

Band E microwaves, typically operating in the 60 GHz frequency range, are not suitable for communications primarily due to their high atmospheric absorption and limited range. This frequency is significantly affected by oxygen and water vapor in the atmosphere, leading to poor transmission quality, especially over long distances. Additionally, the high frequency results in increased susceptibility to obstacles and interference, making it less reliable for communication purposes compared to lower frequency bands.