For Heltec LoRa 32 V2 915 MHz boards with no headers soldered in. I think they sometimes include different antennas, so see the image for the type this is designed for. No other hardware required: the halves slide together. Make sure to put the base on the right way around so that the detents match up. I personally zip-tied a battery to the bottom.
The author marked this model as their own original creation.