• 865,2Mhz 
• LoRa SpreadFactor 12 
• 3 dbi antenna 
•  one unit in attic window, second in hand.
•  No direct view, some small hills and houses

Not reliable, I need some walking and search.

Poll for protocol finished, Meshtastic is winner ;) Yesterday I started protocol adaptation. I am not sure if I can fully implement routing in to Armachat device but I want negotiate with Meshtastic authors about injecting packet to Meshtastic network and then forward with they nodes.

For now I am very satisfied.  I think connection to  2km is very reliable.

I can imagine solution with only one simple repeating node above hill or church and cover large area with lot of users.