Thanks for the replies so far, let me clarify. Ultimately I want to end up with a system that: sends an email to an end user when a sensored event occurs at either remote location, without human intervention. Example: electric Power off or on; low water pressure in a pipe on or off; low water level in a tank ; and a daily pulse count being read at the 2inch water main meter.

My constraints: There is no direct line of sight between the three loctions, which are roughly aligned on a single axis: home, loc1, loc2. All locations are surrounded by 50' trees. Loc1, in the middle, is at the highest point.

All locations have commercial ac power, but would need to have a battery backup. Am assuming a gateway at loc1 and loc2 with sensors hardwired to each gateway. So the problem I'm attempting to solve is the comm link from each loc to my house where I can get the data onto the web unless it is already in the right format (email). There's no actuators involved.

Thanks @skywatch and @alowhum for your suggestions, getting me thinking rf is the way to go. Looks like the Lora may have the range I need: 2500' and 3000' between the locations. And like @mfalkvidd y'all are right, field testing is going to be required. I just need to figure out how the comm needs to work.

Would rf, from say an rfm6995 or LoRa, be strong enough to reach through the undergrowth, or does it need an antenna above the trees?

Thanks to all for your help.

@mfalkvidd Thanks for the quick reply. Problem I have is that all three locations are in dense forest, so LOS is a problem. Would rf have the range to reach the three locations?? I've got a lot of learning to do.

I have two detached structures about a half mile from each other and about the same distance from my house. I want to monitor several things at both structures: electric power off or on; pulse count on a 2 inch water meter; valve open (simple pressure switch); and solenoid contacts open/closed. These sensors are already installed at both locations.

I want to replace the commercial alarm company equipment and their two cell phones, with an arduino type controller, and send data via wifi to my home location. I think this is doable with the right wifi antennas aimed at hotspot at my home. But I need some guidance/help in figuring out how to put it all together.

Is this doable? I'm beginning the design stage and want to cost it out.