Antennas play a very important role in the modern communication system. In order to keep secret in military communication, communication technologies of Frequency-Hopping and Spread Spectrum have been widely used in the Communication equipments such as VHF radio , which makes broadband and high gain antennas are more demanded. The way how to broaden bandwidth and increase gain of antenna with multi-dipole structure is one of main content of VHF antenna researches。
This paper mainly researched omni-direc...