I want to put a TTN Outdoor gateway on each side of a tunnel and see what kind of coverage I could get in a long straight tunnel.
After a bit of googling I have found that the Metro in Paris has used LoRaWan to provide coverage during construction
http://www.wyres.eu/case-studies/wyres-indoor-geolocation-rer-paris-lora/ . They used directional antennas in their setup and I was wondering if anyone had used directional antennas with the outdoor TTN gateway or any antenna recommendations?