No qualifications needed.
1. Anything that conducts electricity will radiate a signal. Doesn't mean it performs as claimed.
2. Tom W8JI thoroughly debunked the 'helical wrapped small looped' supposed theory and claims.
3. A Fool and his money....
4. What do people's driving habits have to do with antenna design?
Rich, K8NDS, the designer is not making any claims that it outperforms standard antenna designs. It sometimes, like all antennas, will be the same or close to the performance of standard antenna design without the cost and weight of solid copper pipe, and could be tolerated in an HOA neighborhood. The helical design is not that popular, yet, but with the QRM noise of poorly maintained electrical systems in Europe and the price of land, a magnetic loop antenna is usually the antenna of choice.
So Tom, W8JI, makes a statement and the entire world stops. I read the back and forths on eHam when K8NDS introduced his design and I know Tom was in the fray with his theories.
Why does some different idea about an antenna get trashed, when the OP is looking for some guidance on a magnetic loop antenna? I gave a little testimony about what I built and a link to look at the design and consider building it. Once we get into the typical internet rants of "he says, they say"; then the entire idea of experimentation is down the tubes.
The OP wants to build something for 20M.
He can build the 33" diameter version of the Helical wound design and be on the air with a reasonable signal and QRO power.