ESP8266 is worth checking out because its dirt cheap, but it really depends how "clean" your line of sight is. 900 MHz radios will have better propagation. Migh

ESP8266 is worth checking out because its dirt cheap, but it really depends how "clean" your line of sight is. 900 MHz radios will have better propagation. Might want to check out something like this: http://rpi900.com/hardware/introduction.html http://rpi900.com/hardware/introduction.html