Regarding the antenna section, due to the prevalence of DIY designs, it is difficult to identify the original developers for each existing design. I recommend allowing designs that can be categorized under a common term (e.g., "GP antenna," "DP antenna," "mesh antenna," "Yagi antenna," "spiral antenna," "square box antenna," "cone-shaped antenna") without specifying the manufacturer's name. I have a large collection of basic antenna designs that I would like to record = =
Furthermore, SDRs that can only receive and not transmit – such as those from SDRplay, Airspy, and even the well-known RTL-SDR – seem to fall into a gray area. They don't fit neatly into the category of "radio" and might be better classified under "other."