This so-called "antenna" is at best dumb, and at worst a rip-off. As
master antenna-designer N6BT wrote some years ago, "everything 'works,'
even a light bulb." He demonstrated this by mounting a a light bulb on a
wooden fencepost, feeding with coax that he had carefully choked so that
the coax could not radiate, and working all continents with it.
As others have noted, antennas like magnetic loops, loaded whips
(HamSticks, etc.), and long wires are the weapons of choice with limited
space and/or requirements of minimal visibility. If the frame of the
building is non-metallic, indoor antennas can work (but can also be
mondo noisy on RX). If the frame is metallic, the antenna must be
outside. The good news is that the building frame will work fine as a
counterpoise (although it may block the antenna in the direction of the
building). A long wire launched away from the building is best -- small
diameter enameled wire can be hard to see, and works fine as an antenna.
73, Jim K9YC
On Thu,4/7/2016 2:41 AM, Petr, OK1RP/M0SIS wrote:
I am sure that David talked about an Isotron antennas like this:
https://www.isotronantennas.com/
I intensively tested/used this antenna in 90's on 40m (product from Sigi,
DK9FN) and I have to say it is a nightmare in overall. From my own
experiences the performance of this toy was highly dependent to the
grounding availability, bandwidth was very small and tunning was influenced
by ground only but also by closed objects a lot.
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