Amateur radio, also known as ham radio, is the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication. The term "amateur" is used to specify "a duly authorised person interested in radioelectric practice with a purely personal aim and without pecuniary interest;" (either direct monetary or other similar reward) and to differentiate it from commercial broadcasting, public safety (such as police and fire), or professional two-way radio services (such as maritime, aviation, taxis, etc.). The amateur radio service (amateur service and amateur-satellite service) is established by the International Telecommunication Union (ITU) through the Radio Regulations.
My oldest sister (R.I.P.) was a HAM radio operator for as far back as I can remember. She also built her own equipment.
She was listening when the U.S. invaded Granada and told the family about it.
When she started getting sick with 3 different types of cancer, of course she stopped. I actually use one of her old 64' towers for the "off air" TV channels.