How reliable is the return home function if signal is lost?

[Meta4]

Thanks y'all. You've restored my confidence in the RTH. It must be just the 1-in-a-thousand people that are making a lot of noise about them losing contact and having their drone go rogue.

There are always users that are confused because of a lack of understanding.
Some don't know when their Phantom has completely lost signalas opposed to when it has just lost the video downlink.
They can have the Phantom hovering with full control signal waiting and waiting for them to tell it what to do.