They are probably all about the same. Just a basic Triangular Dipole, with no reflector or director elements, so it's bi-directional.
Not any real signal gain over any other dipole.
I have a similar one, but haven't tried it out yet (just added to my collection).
I'd go with one like this in the city, if I didn't have room for something like a (directional) Silver Sensor to sit somewhere. These can go up high on a wall, or in a window.