I’m sure this has been mentioned before, but just in case I wanted to share that I get a much better rssi if I uncoil the antenna from my emonTHv2 and stick it out of the case. This is the effect on rssi:
Looking at a month of data, I would say rssi has increased from -85 to -55, roughly.
The number of missed packets reduced, but it’s harder to see that on the graphs.
Hope that helps someone,