 Working with wireless electronics means thinking about antennas. Some electronics include antennas built-in, but some, like this Lora module, need an external one added. You can buy an antenna, but you can also get by using a simple quarter-wave monopole made with wire, SNPs, and a little math. First, find the wavelength lambda with this equation, where C is the speed of light about 300 million meters per second, and F is the frequency of the signal you're working with, in this case, 915 MHz. We just need a quarter of that wavelength, so divide it by 4. And the result is the length of our quarter-wave monopole antenna. Cut that length in wire, solder one end to your antenna feed, and you're ready to radio.