What kind of structures and shapes attract occult energy and which ones repel them off?

Energy is energy. There is no difference in the type of energy raised at a Wiccan circle and the type of energy raised at a Pentecostal tent revival. It's all energy. What is different is how it is directed and used by the devotees of the two faiths. Wicca attempts to direct the energy to a clearly visualized benign purpose. The tent revival participants raise a lot of energy, but they are much less focused toward a defined goal.