http://www.afar.net/tutorials/900-mhz-versus-2.4-ghz/ http://www.afar.net/tutorials/900-mhz-versus-2.4-ghz/ 900Mhz does not buy much for distance, however it w

http://www.afar.net/tutorials/900-mhz-versus-2.4-ghz/ http://www.afar.net/tutorials/900-mhz-versus-2.4-ghz/ 900Mhz does not buy much for distance, however it works better under difficult line-of-sight situations comparing to 2.4Ghz. For real long-distance 4xx/3xxMhz might be better, or even the frequency we used for FM/AM radios.