From the ARRL review (2/06) of the CHA-250B, which is probably just an older version:
[Comet’s] literature
merely states that the antenna will radiate a signal and provide a low SWR on all bands without the use of radials. In this respect, the CHA-250B performs as advertised. It is neither a miracle nor a fraud.
The reviewer does say it was OK on the higher bands and pretty bad on the lower bands. My guess is that if you can put down some radials, you’ll have better luck with an antenna that uses them.
Something like this, for example.
https://www.dxengineering.com/parts/cma-cha-250hd#overview
From the ARRL review (2/06) of the CHA-250B, which is probably just an older version:
The reviewer does say it was OK on the higher bands and pretty bad on the lower bands. My guess is that if you can put down some radials, you’ll have better luck with an antenna that uses them.
I was considering one for a root mount.