I believe the antenna controls in SDRAngel for the LimeSDR Mini are labelled incorrectly, I have done another test at 144 Mhz CW and get 18.8dBm on Hi and -0.6dBm on Lo
I used the graph in the linked information to confirm what I should be seeing:
Looks like my sheap chinese meter is pretty accurate!
Message left for Edouard in the SDRAngel groups.io page
Kind regards
Mick