As others have mentioned, he should consult an attorney and definitely address the decommissioning issues. If the company pulls out, leaves, stops using it, etc, who’s responsible for the tower?
I used to know the guy that owned this tower company.
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Did a bit of business with him at my old job to rent tower space to get internet across the state line wirelessly to avoid paying tariffs had we used land lines.
He owned a dozen or so towers, and rented to cell phone companies, businesses, governments, etc.
So is the entity approaching your brother a cell phone company that will only have their equipment on site, or someone that just rents tower space to whomever needs it?