During a seven-day auction on eBay that ended on May 29, Novocin says he sold four items, including an X-Band Weather Radar Modulator for and a high-frequency radio circuit card for .

The operating band of an individual antenna covers e. g. the frequency range used by a radio system or only the transmitting or receiving band in that range.

Short wave is radio frequency band earliest utilized by human being, and short wave communication is one modern communication method with a long history.