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How can I extend the range of the RFXtrx433E?
If you need to extend the RFXtrx433E receiving range you can connect an external antenna such as the Aurel 650200313 433MHz Radio Kit.
The location of the sensor and the RFXtrx433E transceiver is also very important, especially if the RF signal has to pass through walls. Chapter 2.5 in the RFXtrx433E User Guide has some important tips.