Back in my business/ham radio days, I had enough equipment at hand to converse ...to 300 GHz and beyond,
300 Ghz!
Thats fantastic! (Or was it a typo?)
Oh, I just assumed he was referring to infrared transmissions as beyond 300Ghz.
Likely trying to transmit by bouncing lasers off the moon.
EDIT:
Hi Lon, the link Be_Prepared posted to the American Radio Relay League is a very good one.
http://www.arrl.org/ARRL is the grandaddy of all Amateur Radio organizations in North America.
If you want to know anything about personal radio communications they are the people to go to.