Hey y'all good folks, I'm attempting the 3D Corner antenna build described in the Frugal To Advanced (pdf) paper, which is based on this Pulsar (pdf) observation design.

At the bottom of the Pulsar paper, there's a section for designing around different wavelengths, and the active element for 1420Hz comes out to 15.834 cm. In the rest of the Frugal paper, the author uses a quarter wavelength of 4.9 cm.

Sooo I guess the question is, what gives? Is my math off? Or is there another way besides quarter wavelength to get resonance that the Pulsar design uses? The image in the Frugal paper shows an active element that definitely looks bigger than 4.9 cm.

Also, the Pulsar paper includes a passive element, but it looks like this version of that design does not. So, how much is there to gain (lol) from a passive element? Any other advice for this rig? Thanks!

Edited: updated the Pulsar paper link