If an ELT is still transmitting the helicopter will find the crash site. I have located them myself with a VHF portable radio a couple of times. One time after a one week search for an experimental plane that crashed coming across the desert going to ONT with our old B737's we could control the squelch so heard a very weak ELT signal and told ATC where it peaked abeam a mountain just north of ONT and they found the wreckage the next day. They said a Russian satelitte found it the next day but I don't think so. Another time at Chino airport I used the portable radio to slightly off tune the ELT freq and when it peaked, went 90 degrees to the peak and found the plane with the ELT transmitting so told the FAA where the ELT was. The helicopter will have a directional finder so it should be easy to find.