World's Largest Supplier of Amateur Radio, Ham Radio, and Communication Equipment. Sales, Supplies, and Service. 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;" and to differentiate it from commercial broadcasting, public safety, or professional two-way radio services. Ham Radio and Amateur Radio online equipment sales. HamCity has more than 30 years of experience in the amateur radio equipment business!