DIY: How to build a Passive Resonant Transformer-Coupled Loop Antenna for HF reception

We recently posted a tutorial on building a simple Noise-Cancelling Passive Loop (NCPL) antenna. This prompted SWLing Post contributor, Bob Colegrove, to share his excellent article on building a Passive, Resonant, Transformer-Coupled Loop (PRTCL) Antenna: A Passive, Resonant, Transformer-Coupled Loop Antenna for Shortwave By Bob Colegrove Over the years I have resisted the level-of-effort necessary ["]