Another solution may be in the NRF25L01 radio modules. With those 1 base module can listen to many transmitters.
Simple RF24 tutorial to get started >> Simple nRF24L01+ 2.4GHz transceiver demo
RF24 network >> https://howtomechatronics.com/tutorials/arduino/how-to-build-an-arduino-wireless-network-with-multiple-nrf24l01-modules/