There are two big problems with Magnifico´s hidden hyperwave transmitter. One, in previous part of Foundation and Empire, we hear that ultrawave transmission has a limited range. When Devers fled Riose´s base, he tried connecting to the Merchants - with difficulty because of the extreme range. Specified as 500 lightyears. It follows that Mule, or any non-psychic agent whom Mule may have sent out, could not have kept ultrawave communications with the headquarters of Mule´s army if they were out of the range for listeners of Mule´s army. Two, Mule could have detected, and given memory gaps, to any people who confronted him when operating his radio transmitter. But how about people elsewhere on the planet listening to ultrawave spectrum for any broadcasts not authorized by their side? Mule would not have been physically near them to tamper with them, and he would not have known where they were.
Hyperwave transmitter
One, in previous part of Foundation and Empire, we hear that ultrawave transmission has a limited range. When Devers fled Riose´s base, he tried connecting to the Merchants - with difficulty because of the extreme range. Specified as 500 lightyears.
It follows that Mule, or any non-psychic agent whom Mule may have sent out, could not have kept ultrawave communications with the headquarters of Mule´s army if they were out of the range for listeners of Mule´s army.
Two, Mule could have detected, and given memory gaps, to any people who confronted him when operating his radio transmitter. But how about people elsewhere on the planet listening to ultrawave spectrum for any broadcasts not authorized by their side? Mule would not have been physically near them to tamper with them, and he would not have known where they were.