I don't know exactly where you are. However, if you become a member, see link http://s4gru.com/index.php?/topic/1195-information-about-s4gru-sponsorship-levels-and-how-to-become-a-sponsor/
, you may pull up maps to review where the closest tower is.
If a tower is right next to you, it may come down to building materials, foliage and other external factors.