To a casual observer, 'millimeter wave' frequencies seem like a poor choice. From what little I know about RF, bands in the millimeter wave spectrum are going t

To a casual observer, 'millimeter wave' frequencies seem like a poor choice. From what little I know about RF, bands in the millimeter wave spectrum are going to suffer from lots of signal loss just due to attenuation from air and humidity, and won't have particularly great range or penetration capabilities. That said, my knowledge of RF tech is limited to 'enterprise' wifi concerns and amateur HAM radio, so I might be missing something here.