To be quite honest, I've tried these squared halos, have tried round halos, and am in the process of trying out something called an OmniAngle, (check these out at their website: http://www.parelectronics.com
. I also plan on reviewing these antennas for eham. ). Something in the form of an antenna that I came across while researching omnidirectional/horizontal antennas for 6m was this thing called a Hen Antenna. It's called a Hen Antenna by the Japanese. These folks LOVE 6m. One of the curious things to come of their love for 6m ops was this thing. Check it out. I've tried it and the silly thing works! I think I might have spent all of $7.85 US and maybe about 35 minutes in stringing this this this THING up in the air. Give 'er a try! What can you lose? I tried it, liked it, and use it on camping trips and other outings. The word 'Hen' in Japanese means mysterious, or curious.
From what I understand, this curious antenna can also be adapted in size to work on 10m, 2m, and even 70cm.
You can find out more about this curious antenna at the following website. http://member.nifty.ne.jp/tasaki/Hentenna.html