If activating "Use online elevations" in the settings & marking the checkbox "Above ground" on each waypoint... the set height for each waypoint will be above ground right below the waypoint & not relative the takeoff point.
This works ok, but...
Hi there & welcome to the forum 👋
DJI only have one RC that they call "Smart Controller"... that's the one with RM500 as a model number. And this one is the only "sceened" controller that's compatible with the DJI Mavic Air 2.
In general...
Higher temperatures = higher internal cell resistance = probably more pronounced voltage drops during load = increased risk of quicker electrolyte decomposition with gassing as a consequence = swelling.
This points to inferior...
You shouldn't use a Yagi-Uda intended for 5,8GHz when using 2,4GHz... it will just make the transmission range worse than without.
Instead manually set the frequency to 5,8GHz in the settings in the GO4 app.