Originally Posted by mb67
RF is still used today. The USAF uses all parts of the RF spectrum and I'm amazed at how we were able to set up a copper wire antenna array and communicate with an HF radio operator in Holland.
Here's a graphical pic of the RF Spectrum:
I also am a Amauter Radio operator
Play with HF, VHF, and UHF Radio equipment, as well as Ananlog, and Digitial Modes
With my little wire dipole antenna an 10 watts using a Difitla interface with my computer I been able to make contacts all around the world.