I think that I'm the only South African falconer using a Marshall 173mhz set at the moment. I've always used 173 and am very happy with it. It makes life so much easier when tracking a truant bird at SAFA, because I know for a fact that the signal I'm receiving is from MY bird's transmitter and not from all the other 216 transmitters which falconers have forgotten to switch off. Most falconers in SA use 216, and it can be quite disconcerting when tracking a bird and you have 5 other signals to compete with in terms of locating your signal. confused