Pieter-Tjerk de Boer, PA3FWM web@pa3fwm.nl (This is an adapted version of an article that I wrote for the Dutch amateur radio magazine Electron, January 2014.) A well-known active antenna for the LF, MF and HF bands is the "MiniWhip" designed by PA0RDT; see [1]. Many ideas and misunderstandings have been voiced about how this antenna works. In this article, I hope to shed some light on this, by us