Today I have painted antennas!
These come in Black, Gray, Green, Light and Dark Blue, Orange, White, Yellow, Red, Pink, and Rainbow! These replace the default Gray antenna.
Pretty much how you would install any other custom decals/flags, just open the texture in uMod.
Here is an example: https://www.youtube.com/watch?v=EeBZUhKdq_Q
Make sure to use a flag or another antenna! :D