If your Farm Policy covers commercial hunting you should be good. Individuals should be fine directly leasing. It's when you get into non family groups or clubs they may need their own policy. A lot will depend on how the lease is drawn up, you should always be covered. It's the lessees that may not be. A conversation with your agent can help you understand what your policies cover, what most personal policies cover, and what a lessees policy would cover. Your attorney can tell you if you should require a lessees policy.
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