I would seek an initial surface payment for land damage/construction of the tower (depending on the footprint, maybe a few thousand dollars).
Next find out how it will affect your taxes, the tower will have a high tax value compared to rangeland so make sure your annual/monthly lease payment is enough to generate a profit after taxes.
I have found that it is not actually (at least in most cases) companies like att or verizon owning the tower but third parties that just lease tower space or transmitter/reciever time to the big companies so the chance of getting a good internet deal might be slim...
Also make sure like already mentioned to protect yourself for the future. Understanding of fencing around the tower, gate/road access, what happens if it is not is use anymore, tornado knocks it down, etc...