That's a T2FD:

http://www.hard-core-dx.com/nordicdx.../t2design.html

Broadband, to be sure....but you're not going to be able to run high power unless you source a high-wattage, non-inductive resistor for the thing.

The above being said, a T2FD makes a great low-noise receiving antenna - but it'll be down an S-unit or so in received signal strength as compared to a dipole of the same dimensions. A lot of DXers use them.