How much are they Mike? I wonder if I could reach you with a node.
Discussion
https://www.amazon.co.uk/dp/B0F1CYWVLC
I'll be building a repeater node and putting it in my loft with a decent aerial in the next few weeks.
The great thing about meshtastic is, as the name suggests, it operates as a mesh so devices (both input and repeater) will repeat a signal to help it get to its destination.
You can choose weather to repeat messages between 0 - 7 times)
This is the way