Jack Twilley wrote in message ...

Out of curiosity, what other antenna provides a better cost-benefit
ratio while maintaining the same constraints with respect to power,
size, and construction?

A well made G5RV, for one. A well-made W3DZZ trap dipole, for another.
W5DXP's "linear tuner" dipole, for a third. Or the classic
dipole-with-openline-and-a-real-balanced-tuner for a fourth. All are
much more efficient than a T2FD of the same size.

The B&W/T2FD is discussed in detail on W4RNL's excellent site (which
see). In short, its efficiency is quite low on the lower bands and
gets to be almost as good as a halfwave dipole on the upper bands.
Their one and only advantage is low SWR over the frequency range.

73 de Jim, N2EY