I guess I didn't mention too much in my previous post as to what my program actually does. My program creates a jpeg image that is then used as an overlay in Google Earth. I specify the boundaries of the overlay image in the KML file and viola, you have a signal coverage map. I was thinking of also adding the feature of plotting the points in GE instead of doing overlays, but that might require a rather large KML file. It sounds like you are trying to do this and that might be where the chaos comes from. I haven't really experimented with all the shapes, dots, lines that GE offers.
Here's an actual screenshot from Google Earth:
http://www.bitcorruption.com/alerus2.jpg