You do not want to create bad feelings with those who live near your grove tree. Find a grove-climbing tree that is easy to get to. Bags of climbing gear weigh considerably, especially if they must be carted long distances. After a day of climbing, a long trip back to the car with heavy gear bags can be demoralizing. You must get permission from the owners of the tree if you intend to climb on a regular basis.
Land owners come in many different forms.
Every form of land ownership will involve groups of people that have the authority to grant you permission to climb their trees, the only exception being the private landowner. The best bet is dealing with a private landowner or homeowner. You will be dealing with the fewest number of people involved in the decision making process most likely on a personal basis. This gives you more room to comfort and convince the owner that having a group of tree climbers will not only be safe but the tree involved could benefit through personal tree care. You can also tell owners they will be meeting a great group of individuals worth knowing.