I hate to break it to everyone here, but after studying vibrations as an engineer for years, lower frequency sounds DO NOT travel farther than higher frequency sounds. At least it does not have a direct relationship on it. This is a common misnomer. Distance a sound wave travels is a function of the amount of energy(work) and therefore intensity (amplitude) of the sound wave, not the frequency. In a controlled and steady state environment, frequency has no bearing on the amount a sound wave travels through a controlled medium (air, water, etc..). However, lower frequencies are more "capable" of bending and/or penetrating obstacles than higher frequencies. It all depends on how many and how large obstacles are between you and the source or origin of the sound. That sound you hear from the youngin's car from a mile away you think is because of the low frequency (bass), but in fact is a direct result of the intensity of the sound waves measured in (db); not Hertz,the measure of frequency. ENERGY, ENERGY, ENERGY. Think of light, heat and sound. As the more energy the source emits, the farther away you can see, feel, and hear it respectively. I can directly quote a physics text of mine if need be.
So, what does this mean? A turkey making a spit and drumming sound may in fact be at a lower frequency, but it will not travel as far as a gobble because the bird puts more "work" into the gobble than the spit and drum. If one could measure the amount of calories (energy) a bird burns during each activity (gobble and drum), you could determine, which sound will travel farther because energy is always conserved (Newton's second law). Or you could measure the amplitude of the sound waves emitted, which would be much easier I suppose. I would be very, very astonished if you could hear a spit and drum from miles away. That is frankly a falsehood IMO and should never even be discussed, as the intesity is much too small to travel that measure of distance. Now, using it as a call at short ranges may be effective, but probably only if a gobbler is hanging just out of range and absolutely nothing else is working to get him to within shooting distance. I'm guessing it will have a similar effect as a gobble call, meaning it could pi#$ a bird off enough to come runnin' in and challenge or send him runnin' for the hills in fear of an arse kickin'. I'm not sure as I've never tried it before on a bird to know the reactions it would bring in different situations.
"After eating an entire moose, a mountain lion felt so good he started roaring. He kept it up until a hunter came along and shot him. The moral: When you're full of bull, keep your mouth shut."