Hi
Generally speaking, the radiation pattern of a dipole or 2 element Yagi antenna primarly depends on antenna elevation above ground. A higher elevation would lower the main lobe radiation angle, which would be better for DX. For instance, at 8m elevation, a dipole would have its maximum radiation at some 18 degrees.
On the other hand, the radiation pattern would be affected by surrounding objects as well, in a good or in a bad way (in most of the cases in a bad way). This effect would be amplified if the adjacent object is an antenna working on the same band.
The first setup (a scrap dipole installed at about 1.2 m below Maco 5/8 vertical) would not be adequate, mainly because the dipole is too close of Maco's counterweights (operating at same frequency). Depending on their actual length, the counterweights would act as a reflector or director for the dipole antenna. The result would be that most of the dipole radiation will be directed straight upwards at 90 deg. angle, either directly or by reflection from ground. That's bad.
There is only one sweet spot, that is the dipole should be installed at minimum 5.5m (some half lambda) below Maco's counterweights. Also, the dipole itself should be at some 8 m elevation. In such case, Maco's counterweights would squeeze dipole lobes downwards, and the main radiation angle would be lowered to some 13 deg. That's good.
The second setup woud be better, due to the fact that the distance between Yagi boom and Maco's counterweights is bigger. However, the dipole itself should be installed at some 8m off ground, to ensure a low angle of radiation in the first place.
4nec2 software can easily model both setups, and it is FREE:
http://home.ict.nl/~arivoors/Home.htm
Best regards,
Julian
