Patent No. US 9,407,001
COMPACtenna … COMPACT antenna
With a special design construct of spiraled metal sheeting, all resistance, inductance and capacitance (matching) is efficiently done by the physical metallic geometric form of the antenna itself as opposed to internal or external (lossy) components, with better performance than expected for such a small antenna.
And resulting diverse effective magnetic and electric fields further enhance performance in our world of (dynamic) obstructions.
6 Minute Video of Tom Medlin of W5KUB.com Interviewing
Dr. Jack Nilsson Regarding 7″ COMPACtenna Model 2M/220/440 :