We had a big discussion regarding spread spectrum at our club meeting tonite. The jist of it is, the system works on a basis similar to cellular phones, of the transmitter scanning for unused "channels" within the 2.4gHz range. The receiver will only "recognize" a transmission from "its" transmitter, so other planes flying are doing the same, and no interference between transmitters. This system was supposedly tested in all conceivable circumstances and environments to see if there would be "glitching' by control rods, on-board electronics, etc--all the stuff we have to watch out for with the present 72 mHz system. So far, nothing has been found to be a problem. The limiting factor right now is Tx range, which is why it's only being used for park flyers right now. According to one of my clubmates, somebody at one of the recent fly-ins at Joe Nall (Tripletree) took a Tx out to the highway, there at the railroad tracks for those familiar with the area, and it still controlled the plane they had on the flightline at the gazeebo. That's well over 1/2 mile, probably closer to 3/4 mile. Maybe the reliabilty at that distance is still debatable, but this is supposedly the future of R/C transmitters. from what I understand, the 72 mHz band will stay with us for a long time, we're not giving one up to get the other. Don't throw your old Tx away just yet