Trying to think outside the box. Combined intruder alarm and CCTV.

[sixwheeledbeast]

Not much will work in a faraday cage obviously. Metal will reduce range.

Mesh is better with more nodes, so having single devices to repeat through like a bridge is not ideal.

Having a couple of contacts local end, direct to devices in the remote building much better.

If this isn't suitable I'd say it needs a self contained system and would steer towards that option anyway dependant on usage of the buildings.

 

[MrHappy]

get your property to finished surfaces -

 

oh, I think I have a burglar alarm....