It's range is largely due to the frequency as well, not the modulation scheme. > it's a no-brainer to use a highly efficient modulation scheme with error corr

It's range is largely due to the frequency as well, not the modulation scheme. > it's a no-brainer to use a highly efficient modulation scheme with error correction. And an audio codec with a good ecc scheme on top. You can shove huge amounts of data into the AM spectrum, there's no reason it should be filled with pops and fizzes.