Microwave link capacity

In a context of providing rural communities with modern broadband. Reading some tells me that Microwave links can be raised to 1gbps. How common is that ? I assume that cell phone towers have modern microwave links (when not directly on fibre). What sort of capacity would typically be provided ? And in the case of a remote village/town served by microwave originally designed to handle just phone calls, how difficult/expensive is it to upgrade to 1gbps or higher capacity ? Just a change of radio ? or radio and antenna, keeping only the tower ? (keeping spectrum acquisition out of discussion as that is a whole other ball game).