Bob Rive VE3HKY has cretaed 2 different 7-band antennas, the first was a 7-Band Semi Vertical Trap Antenna, and the latest, 7-Band Portable Dipole. I was introduced to his antennas when I attended the June meeting of LARC and he did a presentation on the 7-Band Portable Dipole. The video he showed that night is now available online.
Links:
7-Band Semi Vertical Trap Antenna
Video -construction of the Semi Vertical Trap Antenna
7-Band Portable Dipole