The locations of the radio masts seems to be causing a bit of a problem so here are a couple of images that should help the lost sheep.
These are the locations of the masts within the radio complex (detail of the main Rhem map):
These are the locations of the masts translated from the radar screen onto the plan you got from the 4-Way tower and then matched to the numbers from the map:
These are the settings you need to enter into each of the radio masts:
If you have found this walkthrough useful, discovered an error or have a suggestion then let me know: feedback.