First, you (may) need have to have fairly good hearing, up to about 15Khz. First, mute the audio on your TV and see if you can still hear the horizontal frequency. Its is a very high pitch, and the only audible sound from a television today. Now, in a quiet room with no TV just listen. Do you still hear a sound much like that? If you do, THAT is the high frequency tone.
I've spoken to people across the USA that can hear it. One may or may not, need to have hearing that can reach that high. The older we get, the more the high frequencies are attenuated. If this is being induced into the auditory system without using the ear, then one may still hear it. To me, it reminds me of the frequency you would hear from older ultrasonic transducers, like those used in alarm systems.
Here are some characteristics of 'the tone':
It remains to be seen if this is another form of mind control.
The source of the high frequency tone signal is not yet
known. It is most likely a ground wave. If it is being
delivered from satellite it would be attenuated by going
underground, which I've proven it is not.