For contact, Spooky is sending plain old electricity in the form of whatever waveform, amplitude, offset, frequency and duty cycle is selected... With this many variables, there are obviously many different forms the waveform can take.
AM Radio band is in the 530KHz to 1.7MHz range.
FM Radio band is in the 88 - 108MHZ range.
Since Spooky can send signals from 0Hz to about 25MHz, so all of the audio frequencies up through the AM radio band and on up to 25MHz. It does NOT go up into the FM radio range.
For more details, please check the link: