As described in the brief spec of nRF 21540：
the nRF21540 improves the RX sensitivity by 5 dBm to -100 dBm.
5dBm should be 5dB，you can't make a simple plus/minus equation to calculate the RF power.
-95dBm-5dBm=-100dBm (Wrong)
-95dBm-5dB=-100dBm (Right)
