LoRa radio is a low-powered radio. It’s quite sensitive to external conditions. To get a stable stream, it needs a clear line of sight. But if you’re working in more challenging conditions, external radios can be indeed handy. Some time ago, we tested Reach RS+ with external UHF radio. You can check more details in this post:
Hopefully, other users can share their experience here about using external radios with Reach, too.