Depends on the time of the year.
Early season I will use either a single or two hens. if you do use a jake you need to get in close to the roost area and use a dominant or aggresive jake.
usually with two hens one submissive sitting on the ground and one feeding off to the side.
Later in the season i tend not to use a jake simply cause a 2 year old is already tired of getting beat on by other birds and will most likely hang up.
Most of the time a single hen deke will get them interested enough in late season cause most hens will be on the nest. Therefore i keep them in a walking or feeding position. a hen on the ground could be mistaken for a nesting hen.

kinvjack hit it right on the head when he said to call to the hens. I have seen it time and time again. It works.