Guide · LoRa coverage
Field-map your LoRa coverage before you mount anything.
Do not guess where a LoRa node will get signal. Mount one in a dead spot and you are climbing back up the pole to move it, after you have already drilled the bracket and run the cable. The cheap insurance is to field-map your LoRa coverage on foot first, reading the real numbers at every candidate mount point before anything gets a screw.
Last reviewed: 21 July 2026 · by Rural IoT
Walk the property before you drill
Signal on a rural property is not intuitive. A tank, a shed wall, a hill you did not think about, or wet foliage can drop a link that looked fine on paper. The cheap fix is to walk the site first with a pocket coverage mapper and read the actual numbers at each candidate mount point.
The mapper is a cheap LoRa dev board with a small screen, the sort with an OLED, running tracker or mapper firmware that shows, live: whether it is joined to your network, and the RSSI and SNR of each message. You carry it around the property and watch those numbers change. It talks to the same gateway your real nodes will use, the one described in how LoRa sensor monitoring works.
Running the walk-test
1. Match your real deployment
Same frequency plan (AU915, same sub-band), same gateway, same network the node will actually use. A test against a different gateway tells you nothing.
2. Confirm a join at each spot
Go to each candidate spot and wait for a join or an uplink to confirm. Read RSSI and SNR off the screen.
3. Test at mount height, not head height
Signal at 3 m on a pole is usually better than at ground level, so a borderline reading standing in the dirt may be fine once mounted. If you can, hold the mapper up on a pole or a squid pole.
4. Test the worst real case
Not open air: the node inside its metal enclosure, behind the tank, or in the shed where it will actually live. Metal and water are what kill these links.
5. Walk the path between points
Walk between the spots too, so you learn where the dead zones and the edge of range are. That pays off when you add nodes later.
Reading RSSI and SNR in plain terms
Two numbers, and you want to understand both, because a link can be strong but noisy, or weak but clean, and still work.
RSSI (dBm) is how loud the signal arrives. It is negative, and closer to zero is stronger. As a rough field guide: better than -100 dBm is comfortable; -100 to -115 dBm is workable but worth watching; past about -120 dBm is marginal and you should expect drops.
SNR (dB) is how clean the signal is against background noise. LoRa's trick is decoding signals below the noise floor, so SNR can go negative and still work. Positive SNR is healthy; down to roughly -7 to -20 dB is still decodable depending on spreading factor, but low SNR means retries and lost packets.
Watch the spreading factor and data rate too. A link that only holds at SF12 works, but it is slow and burns battery, and it is a sign you are at the edge. If a spot only survives at the highest spreading factor, treat it as marginal even when the RSSI looks fine.
The combination is what matters: strong and clean is green, weak and noisy is where packets die. Weak but clean, or strong but noisy, will usually still carry, so add margin.
Turning readings into a decision
Green, mount here. Comfortable RSSI, positive or gently negative SNR, holds at a low spreading factor.
Amber, works but add margin. Marginal on one number. Raise the node, move it off the metal, or fit an external antenna before you commit.
Red, do not mount. Weak and noisy, or only joins at SF12 intermittently. Relocate, or add a gateway or repeater to cover the spot.
Do the walk at the worst time, not the best. Wet, leaf-on summer foliage attenuates more than bare winter branches, so a link tested in the dry can fail in the wet. Log a GPS point with each reading and mark the good spots physically, so mounting day is drill and go. If you are still deciding what is even worth monitoring, the farm monitoring guide is the place to start.
The short version
Map coverage on foot before you mount anything. Carry a cheap OLED LoRa dev board running mapper firmware, on the same gateway and frequency plan as the real node, and read join state plus RSSI and SNR at each spot, at mount height and in the real enclosure, not open air. RSSI closer to zero is stronger: better than -100 dBm is comfortable, past -120 is marginal. Positive SNR is clean, and a link that only holds at SF12 is on the edge. Green spots get the bracket, amber gets a raise or an external antenna, red gets relocated. Test in the wet, not the dry.
General field guidance. Verify against your own gateway, regulatory frequency plan and hardware before committing a mount.
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