How do submarines communicate with radio waves?

[DaveE]

There's also a tremendous amount of noise at 50/60Hz and the harmonics. People that work with signal processing in this region know to avoid those frequencies for better S/N ratio.

 

[artis]

I wasn't saying one should directly use the very phase wire , just an additional wire but true , interference would be a problem I think more so for the VLF signal than the 50hz AC as that is much more powerful