A lot of people seem to be struggling to understand the helium coverage tracker at https://explorer.helium.com/coverage. This shows what area is currently covered with helium miners.
The green hexagons are the areas with helium miners installed. The number on the hexagons are the number of hotspots in the area. If you click on one of the hotspots, an information panel will appear. This will show you the make of the miner, how much it’s earning, how many witnesses it has, how high off the ground it is, what kind of antenna it has and so forth.
The information isn’t entirely accurate and relies heavily on the data inputted in by the owner. For example, the owner may have a 10dbi antenna but if they haven’t updated the antenna info in the app, it could show as a 2.8dbi.