Reception of a signal is a key component of mobile communication, so it is important to make sure that the end-device used has a proper antenna design. Consider making the antenna external to the device. Note that it is not possible to amplify a signal that was not received in the first place. IMST GmbH, a German based research-driven industrial engineering and design house specializing in radio technologies, has created an antenna reference design guide for ISM band applications. It can be accessed online
. The figure below provides an overview of several antennas and their advantages and disadvantages.
We highly recommend consulting an expert on antenna design when designing a LoRaWAN device.