"Jim Hampton" wrote

Just out of curiosity, do you have an idea of how
much power the Navy uses on the VLF stuff?

I don't know current QRO, but in the 70's the COMSUBLANT transmitter at
Cutler was 1,700,000W on 15.9KHz and the COMSUBPAC transmitter at Jim
Creek was 2,200,000W on 17.1KHz. The ELF site at Clam Lake is
reportedly engineered for just under 1,000,000,000W at somewhere just
above powerline QRG, 75Hz if I remember correctly. The antenna is just
under 29 miles long.

73, de Hans, K0HB