Download video: 5GHz Coax Dipole Omnidirectional Antenna
Channel: andrew mcneil
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The 2.4GHz version of this antenna gives around 6db gain. Testing the 5GHz version seems to give around the same 6db.
Use a coax with a solid copper centre element. Metal tubes salvaged from cheap telescopic antennas.
5.8GHz ¼ wavelength 12.93mm
5.5GHz ¼ wavelength 13.61mm
5.2GHz ¼ wavelength 14.42mm