Telemetry
From Dronepedia
[edit] XBee
[edit] Buildyourowndrone
2.4Ghz Telemetry kits for the UK and EU markets are now available at Build Your Own Drone
This telemetry kit operates on the 2.4 GHz band and has been tested with a wide range of 2.4 GHz radios, to date none of the rx / tx equipment has had any level of interference, I have conducted range checks to over one mile away and maintained a solid connection between rx and tx on a Futaba 2.4 GHz radio, the telemetry kit has been tested out to half a mile with no drop in telemetry data.
For telemetry kits in the USA, visit DIY drones, they have a 900 MHz kit ready for use.