Shorted SMA plug for EFT-MTR

[GM4LLD]

EF-MTR from LNR

Dear SOTA Activators Two months ago I started using the new EF-MTR (30M/20M tri-band QRP) from LNR Precision. I am happy with the antenna, but I do not know how it works. The manual (http://www.lnrprecision.com/wp-content/uploads/2012/06/EF-403020.pdf) for the antenna does not contain any information describing its operating principles. Could anyone provide me with a short technical description of how this antenna works? It has only one trap, but when used with the stub it tunes up on three ban…