I presume you are talking about halos (Or is it "Halii"?). I dont know but I would think you might be losing gain by offsetting the 2 two metre ones. Have you considered the "Big Wheel" aka "Cloverleaf" for 2 metres? (Phase-able).
Wimo came to the Donnington Park radio rally in about 2004 and showed their range including 2 metre and 6 metre Big Wheels.
The 6 metre one is a biggie but the 2 metre one at about 1 metre diameter is certainly practical.http://www.qsl.net/vk3bjm/mobile.htmhttp://www.wimo.de/cgi-bin/verteiler.pl?url=big-wheel-antennas_e.html