The extendable antenna installed on the RTL-SDR dongle is often prone to tilting, but this mount can effectively stabilize and upright it. The included .STL file is tailored for antennas with a diameter of 6 to 8 mm; if you need to adapt it for antennas with other diameters, you can easily do so by making minor modifications to the provided OpenSCAD file. For detailed instructions, please refer to the guide below.

Compared with my previous design, this bracket is not only an alternative solution, but also achieves a significant improvement in performance and practicality.
https://www.thingiverse.com/thing:6183925
https://www.thingiverse.com/thing:6057513

When printing, you need to add support structures.

As always, I have provided the OpenSCAD source files for everyone, so that you can carry out secondary development or optimize and improve them according to your needs:

• Fromhttps://www.openscad.orgDownload and install OpenSCAD.
• Launch OpenSCAD and open the attached OpenSCAD source file
• You can directly adjust the various parameters at the top of the file, or make in-depth modifications to the code itself.
• Save your changes
• Render the design model
• Export the rendered model to formats such as .STL file
• Carry out the slicing process and start printing.

For more of my design works, please visit:
https://www.thingiverse.com/thinger13/designs