Amazon.com: Ham It Up Plus Barebones - HF/MF/LF/VLF/ULF Upconverter w/TCXO & Separate Noise Source Circuit. Extends The Frequency Range of Your Favorite Radio Down to 300Hz. Made in USA. : Electronics
Marine MF/HF SSB Radio - Guide to Long Range Communications
What are Radio Frequency bands and its uses? - RF Page
ICOM M700, M710 Marine Radio RFI and Noise Reduction Kit, RFI Range 1-60 Mz
Radio Spectrum: ITU Frequency Bands » Electronics Notes
Product Details | Mandurah Marine Electrical
Radio Spectrum | NASA
Medium frequency - Wikipedia
LF/MF Four-Course Radio Range - Avionics History by Richard Harris
ICOM IC-M801E MF/HF SSB Radio Telephone Long Range Communication - Boat Building Repairs & Marine Supplies Perth | All Marine