DIY: How to build a Noise-Cancelling Passive Loop (NCPL) antenna

I've gotten an number of inquiries from SWLing Post readers asking for a step-by-step guide to building the passive loop antenna I've mentioned in a number of previous posts. This antenna is the homebrew version of the commercially-available Airspy Youloop. It works a treat. And, yes, folks"it's fun to build. There are a number of ["]