if your plane is out of sight its probably not out of radio range,if you have a general idea of the direction then try to head it back your way.

if you have lost it then you should have your name address and ph.#as well as your AMA# inside your fusalage in case someone finds the plane/wreckage.

a perfect example; our field is on a plateu above the Pacific Ocean, a member crashed in the drink, the cliff is 150 ft high so its gone for sure theres no way to get down there without a boat.
couple of days later he gets a call from a local guy about a missing plane he found a mile off shore while fishing not too much left to salvage but he did clean out the engine and it ran fine even after the salt water bath.

point is keep your plane within your sight and put your info in the plane for identification.