Living in a Faraday cage, radios do not get a good signal in my home. Normally, I just run an antenna out a window and be done with it, but without modifying my weather radio, and external antenna wasn't an option. Luckily, placing it next to a window in the kitchen gives it good enough access to the airwaves to get a reliable signal. I just needed somewhere to place it.
Enter the general purpose shelf. This is designed to be hung with two screws and there is a slot down the back in which you can run the power cord. It's simple and effective. What more do you need?
Print it with 1.6mm walls, 1.0mm top and bottom at either 0.2 or 0.3mm layer height with 20% infill in the orientation presented. Supports are not necessary.