Typically, we need to have line of sight connections. Higher is better, also because of the earth’s surface curvature. Our units are installed above the canopy of grape vines. Trees and crops attenuate the signal at 900 MHz, a lower operating frequency would have been better for agricultural applications.
Because we have hills here, we cannot always get line of sight and need multiple gateways. The small femto gateways that are coming out seem ideal for that.
We have one station that has no line of sight, it’s behind a hill, but reflects off a nearby mountain to get the signal to the gateway. Reflection is likely how the signal still can get some distance from a manhole.