Dual band GP is like two single band antennas have merged, one rotated by 45° arround the z-axis. Connections are the same for the two antennas: radiator is connected to the same hot-end of the connector, and grounds are connected to the same mass.

This way there is no limit to how many bands antenna can be made. In practice, though, most common are two and three band GP antennas.

dualband gp antenna

For measurements, see the “GP” section.

dualband gp antenna photo

Photo of a commercial dual-band antenna used for long-distance Senao phones

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