Perform QPSK modulation on arbitrary data and hide that modulated data in an image as cycling HSL colors!
Currently the Hue stays fixed, while the saturation and lightness are modulated using the In-Phase and Quadrature channels respectively, but there's nothing to say that this couldn't be done a different way.
The default output image is an animated PNG image, which not too many applications support. The output can be viewed in most web browsers, or it could simply be converted to something like a GIF, with a bit of a hit to the quality.
The main code resides in the antenna-qpsk.ipynb jupyter notebook. Run this with
a modern version of python (>3.10 should suffice) after installing the required
packages in the requirements.txt file. I recommend the Jupyter Notebook
extension in Visual Studio Code for this.