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Underground LoRa device

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mrburnzie:
Hi!

I'm working on a school project where I have to have a sensor underground. The sensor data is not relevant, the thing is that I need to use LoRa.
I know that antenna performance is much worse underground.

What are the ways that I can make this work? What type of antenna should I use? Can a PCB antenna solve this?
The thing is that the sensor must be level with the ground. So the antenna can be level with the ground, but can't stick out.
P.S. I'm not an antenna expert, so please I need as much detail as possible. Research papers are welcome too.

sam[PS]:
what king of ground are we talking about ?

mrburnzie:
Asphalt or concrete

TomS_:
It must be possible, but probably frequency dependent to some extent.

The water meter for my house is "underground", and the water company simply drives around the streets to get readings.

The meter itself is not much bigger than an orange, so no extensive external antenna.

I say "underground" because it's about 1 meter down in a bit of tube with a little hatch on top, so not buried, but not exactly out in the open either. This is on the footpath so the hatch is surrounded by asphalt (in this case), and 5-10 metres from the road itself.

I don't know what frequency it uses.

Marco:
What's the depth? Where's the receiving antenna?

Don't make people pull information like pulling teeth ...

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