Voted Best Answer
Sep 14, 2021 - 11:39 AM
You don't mention whether the radio station was an FM or AM. If FM, then there wasn't likely anything stopping cellular providers from using the tower before. So it may be that they just weren't interested at this location. If AM, then it may have been more expensive for a cellular operator to attach to the AM tower as the tower itself acts as the antenna. (requires detuning for the cellular array)
Either way, there are two things that I would recommend doing. If the tower is registered with the FCC, change the ownership with the FCC as the carriers will use the FCC database when prospecting locations.
Secondly, submit the site to the carriers for consideration. See this page for more details. While this deals with getting a new tower, the contact information at the bottom is the same for trying to get a carrier interested on a tower you own or a building or raw land.
Then just wait- you won't likley hear back from them at all until they have a need in the area. They don't lease spots simply because they are available.