Have a look at the photos of the Rugby VLF Transmitter to see why it is not practical to put one on a sub: https://www.subbrit.org.uk/sites/rugby-radio/ https:

Have a look at the photos of the Rugby VLF Transmitter to see why it is not practical to put one on a sub: https://www.subbrit.org.uk/sites/rugby-radio/ https://www.subbrit.org.uk/sites/rugby-radio/