I use to work with RF about 20 years ago, and just recently got interested again. I have really forgotten so much, but it is coming back to me slowly. I really enjoy RF for some reason. Due to recent health problems, I can no longer do outdoor work. I want to do some home based business. I have seriously been considering a Network Analyzer purchase lately, used ones can be bought for around $3000 dollars. For the small design firms that have a occasional need to test or verify a portion of their design I could do it for them, saving them from having to purchase one on there own. Heck, just renting a VNA cost that much. I could also do custom RF circuit components using PCB design technique. Perhaps assist in prototype design etc. I have not suggested it to my wife as it is a big purchase, and most of my brilliant plans backfire in my face. Has anyone reading this ever tried to do such a business, any do's or dont's you might offer? Do you think this is a folly idea all together? I am not looking to get rich or anything, just earn enough to stay at my current modest standard of living. With Wifi, IoT, and the other wireless areas I think there is still a market for RF design. (Some may say, all the RF is in a chip now, this is not entirely true)