The paper is a review of the research conducted over many years. The conclusions are based on the experimental weight-of-evidence of the many papers cited. My personal comments are in [square brackets].
The following are the key points:
Note: The range of microwave hearing is based on PULSED RF energy.
For anyone wondering why we may experience microwave hearing differently from one another, it's all right here:(1) You need to be able to hear high (acoustic) frequencies in the kHz range.
A quiet environment is necessary because the normal noise levels in the environment mask the perception of RF sounds.
Some other points:
(1) In one 1973 study, microwave hearing was BLOCKED when a metal shield of aluminum flyscreen (like in your windows) was placed between the subject and the radar.
(2) You can hear microwaves in a number of different ways. Two reports from Russian scientists described the perception of pulsed RF signals as polytonal sounds and TINNITUS.
(3) LOUDNESS is dependent the energy in the first 30m s of the pulse, regardless of how wide the pulse is. Thus, if sufficient energy is deposited within a 30-m s period, an RF-induced sound will result regardless of pulse width. For pulses greater than 90m s, loudness will increase along with peak power because the energy associated with the first 30m s of the pulse increases directly with peak power.
(4) The paper states that anyone reporting RF hearing would have to be relatively close to a pulsed source operating in the 216-10,000 MHz range. They don't define "relatively close".
[Remember, this is a cell phone company stating these things. What that means is that they know full well that microwave hearing is possible when someone is close to the source - in their case that would mean a cell tower antenna.]
(5) Very high intensity RF pulses will induce adverse effects such as convulsions and a state of unconsciousness (STUN EFFECT). This was demonstrated by the one of the authors of the paper in a previous study from 1982.
(6) Tests in rats revealed neuronal demyelination at one day after exposure and brain swelling at one month after exposure.
[Maybe that's why headaches are commonly reported among victims. Doesn't fibromyalgia/CFS also have to do with demyelination of nerve cells?]