The best one on the market is Knight and Hale.
Come to think of it, the only one I would ever buy again is Knight and Hale.
Calls like the Lohman only produce a bark. K&H produces a bark and whine. It also has some type of whine meant to be a mating call - but I half*** it and make only a whine and no bark.
It's great - I like it.