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The map you have linked to doesn't mean a whole lot. Have you tried mapping the location and uploading it to opensignal? That is where this data comes from. Individual users have the app loaded onto their phone and they map the area after which they upload the data to opensignal.
Having no coverage on an opensignal map doesn't necessarily mean no coverage. It could just as easily mean that no opensignal app users have not been in that area to provide data for the coverage map.
If you notice, the majority of the coverage on that map is along the interstate and immediately surrounding it.That is because there is likely to be a lot of opensignal app users travelling along that corridor with few of them venturing off the road into the surrounding countryside.
The area you are interested in is a low density population area so it is unlikely opensignal would get many people actually providing data to populate their map.
Possibly if you were to use the app on your phone to map the area you would get a better idea of the signal quality in the area.
