Fly_For_Fun Aser I take it that you have done lots of HEMS flights into fields?
Nop, just a couple hundreds hours in IMC/VMC at night (not hems) and just some secondary tranfers at Night VFR from helipad to helipad, always in twin engine ifr aircraft.
I'm not saying the radioaltimeter is bad, just that is not a key to prevent a crash, as nick and tottigol pointed out there are more important things.
Regards.
Aser