Helium utilizes several methods that reward hotspots for proof of coverage. Rewards are given for challenging (3.5%), beaconing (19.3%), and witnessing (77.2%).
Looking at hotspots on the explorer, there is a transmit scale associated with each device.
This transmit scale is a percentage of rewards that are sent out with every beacon. It ranges from 0.01 to 1.0. This scale is influenced by how many hotspots are in close proximity, thus devaluing the transmit scale of hotspots that don’t provide new and valuable data.
Keep in mind, the transmit scale of your hotspot does not effect your earnings, it merely represents potential earnings from your hotspot to others who witness your beacons. It is advised to keep this in mind when looking for a location for your hotspot, as some locations are so saturated that even though you might get a thousand witnesses, they could all have low transmit scales and thus your rewards will be sub-par. This is one of the most misunderstood elements in Helium mining.