Bill wrote:
Hi,
does any one have constructive comments about this type of aerial?

http://www.bwantennas.com/ama/fdipole.ama.htm

How would it compare against a dipole dedicated to a specific frequency
for instance? I assume not as well, but how much less?

All sensible replies much appreciated, thank you.
I have used folded dipoles quite a bit in my QRP days. I used heavier
300 ohm TV twin-lead, and went through a 4-1 balun. The folded dipoles
have wider bandwidth. So you won't need to re-tune the antenna as often
if you are scanning from one side of the band to another.
I once had a 15 meter folded dipole that loaded up on all. 80-10 meter
bands. But the lose was too great on 40 and 80 meters. The long
feed-line is why it did load up on the bottom bands. Running QRP I did
work DX with it on 20 meters up to 10 meters.
The full wave loop, and the folded dipoles are my favorite antennas!
Jack
NZ9U