I have a simple RPi + RAK831 using a Chinese antenna all mounted on my TV antenna pole in the east of Ireland. The climate here is “temperate” so temperature ranges little by comparison to continental Europe for example, maybe -6 to 25C max range in the main. Right now I can see that the Pi’s CPU is at 30.4C. It is a rainy climate so I think skill in weatherproofing will be more important than temperature tolerance of the concentrator board.
The setup uses PoE injected at 19Vdc beside a small switch in my loft then regulated to 5Vdc beside the gateway. Everything is housed in a IP67 plastic box which should have enough volume and surface area not to overheat in our summer. So far using @kersing’s uper easy to setup packet forwarder (resin.io) with 100% reliability and a great console to monitor/manage the gateway.
Some pictures and words HERE