[Antennas] Any experience of the pyramid antenna?

[Hans Johansson (SM0IMJ)]

Hi,
Does anyone have any type of experience of the (I think it's called) 
Pyramid Antenna?
It's a sort of folded dipole with each leg one sixth of the total length 
(total length is one wave length).
See picture here http://www.mypix.se/ShowFriend.asp?AID=JPJMIOPPLQG
Thinking about on like this for 80m placed on the roof.

73's
Hans - SMØIMJ