5g omni directional antenna.Amateur omnidirectional antenna

　　Amateur radio enthusiasts often use vertical ground plane antennas very effectively in high-frequency bands and very VHF/UHF (high frequency/ultra-high frequency) omnidirectional ground radio communication. This type of antenna has a simple structure, is easy to manufacture, and does not require an antenna rotator, making it popular among radio enthusiasts. On these frequency bands, this antenna can effectively utilize an artificial ground plane composed of radial conductors without the need for absolute grounding. Therefore, it does not need to be installed near the actual ground.

　　As long as the monopole antenna is integrated with the artificial ground radial system, it can be installed smoothly anywhere or at any height above the ground. High frequency antennas can be installed on the roof of buildings and radiation lines can be laid on the roof, while very high frequency/ultra-high frequency antennas can be installed on masts and connected to radiation poles on bases near vertical components. The radiation mode of this antenna is truly omnidirectional in azimuth, while providing extensive elevation coverage with a deep invalid point at 90 ° elevation.

　　This antenna has multiple variants, some of which have radiation element lengths different from the 1/4 lambda version. One very popular version is the vertical monopole with a 5/8 lambda length radiator. For ordinary high-frequency amateur radio enthusiasts, this structure may be a bit too high, but it can fully withstand it in the 6 meter, 2 meter, 70 centimeter band, and even further bands. The advantage of a 5/8 λ vertical antenna is its high gain, omnidirectional mode, and greater compression in the elevation plane, making it more suitable for DX operations with low takeoff angle radiation. Both of these antenna variants are resonant single frequency standing wave antennas. Of course, they can also be transformed into multi band antennas by appropriately using notch filters

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