Distributors and selling your film.

I have now shot 3 documentary films, and the first is ready to go, and the two others soon to follow. I submitted my first to the local networks, that was a little hard to fit into schedules because of the subject matter. Discovery called to tell me they like it, but the subject did not fit this season.

Does anyone know of a good distributor that does not take the lion share of the profit?

Michael