For a Hotspot to have a transmit scale, it first needs to have participated in proof-of-coverage, this can either be a Witnessing activity, transferring data packets, and/or broadcasting a Beacon. A transmit scale will appear once your Hotspot receives its first mining reward. Please note that transmit scales do NOT impact your mining rewards. The scale is calculated by looking at how densely populated your area is with other Hotspots. This scale only affects OTHERS who are Witnessing your Beacon. In other words, you will gain more rewards if your Witness a Hotspot Beacon with a 1.0 transmit scale compared to 0.5 scale.