How can they be linear? There's an unbounded range of signal strength. Right next to a very high powered tower, it's going to get better signal strength than ri

How can they be linear? There's an unbounded range of signal strength. Right next to a very high powered tower, it's going to get better signal strength than right next to a microcell, for example. My impression was that they were just shifting the scale so that more instances would be <5 bars.