A lot of people are quick to admonish this antenna design, citing antenna theory. I hold an Amateur Extra license and have a good understanding of antenna theory. Or, since the word "theory" gives some purists heartburn, I'll say antenna "fact".
These antennas do not go against antenna fact. There's no magic here. Simply put, they have more going for them than against them. That's all.
Is it a dipole or a ground plane with a single radial? There's no right answer. If a dipole, naysayers scream, "Where's your balun? Where's your balun? Where's your 1:1 balun?!" I don't use baluns on my dipoles. Never have. There are millions of dipoles in use performing majestically without baluns. Can "RF in the shack" occur without one? Sure. But that's not always the case. And rarely to the extent of being a problem.
If it's a ground plane, naysayers scream, "Where's your grounding? Where's your grounding? You don't have it attached to an 8-ft ground stake!" I don't ground my ground planes. Never have, be it a Radio Shack GP, Astro Plane, CLR2, A99 or Gainmaster. Adverse effects noticed? Zero.
With both designs, naysayers scream, "Your coax is radiating! Your coax is radiating! Your coax is part of your antenna!" So? I couldn't care less.
Do these antennas provide gain? Absolutely not. Same as dipoles. But they will get you on the air in fine fashion at low cost and effort. So attach a vertical of some sort 103" in length and connect it to a wire of approximately 105". Mount it a few feet off the ground or at a height of just 6" with the wire radial lying directly on the ground. Doesn't matter. Trim the wire for lowest SWR and you are done. Get on the air and have fun. It's that easy, everybody. I guarantee you'll be surprised at the performance.