Recently, a VNA (Vector Network Analyser) has hit the market for $50. This has been one of the most talked about pieces of radio test gear for the past few months. So what is it and how can it be used in our hobby? This is a great article from Hackaday that gives the basics of what this tool can do. .  https://hackaday.com/2020/04/23/so-you-bought-a-vna-now-what/