Typically, 100 feet (35 paces) is the pass/fail marker for 72MHz and 90 feet (30 paces) for Spektrum. When in doubt, check the manual for detailed information. Running the engine during a range check is a good idea, but just make sure the airplane is restrained..... Not that I have experience with that or anything.
ORIGINAL: cappaj1
Speaking of range, which radios in general are supposed to have more of it between 2.4 GHz and 72 MgHz? I would think the shorter wavelengths of 2.4 GHz would make it travel a shorter distance but that's just a wild guess.
I don't know, but It really doesn't matter since the range with either radio type is well beyond being able to see your aircraft to fly it.