Lora


 * https://anthonys.io/using-rtl-sdr-to-open-car-doors using LoraWan, https://www.cooking-hacks.com/documentation/tutorials/extreme-range-lora-sx1272-module-shield-arduino-raspberry-pi-intel-galileo/
 * http://www.libelium.com/products/waspmote/

buy
https://www.aliexpress.com/store/2980023 433mhz module Los about 30km. $45