Hi, I am new in this forum and still can find my way around easily. Please forgive me if I have posted this in a wrong section. I need help from seniors in the field of wireless transmission. I have done a bit of research but not enough to justify any conclusion. I have a project to setup a LRS paging transmitter (TX7470 freedom transmitter) over a 20km coverage radius. The transmitter itself operates on 459.100 MHz frequency and has up to 2 miles radius signal coverage with its own antenna. It is a 2watts output transmitter that also has an option to use an indoor repeater that uses 2 watts output power and can add additional 2 miles radius signal coverage. The frequency range of both the transmitter and repeater (and pagers) is 420 - 470 MHz. I know I should be using a stalk array dipole antenna for this transmission but not 100% sure about this. My questions are then; 1. What will be my effective mast height to transmit over 20km radius? 2. What should be the length of the dipole antenna and the gain to make this possible? 3. What angle should the stalks be to eliminate signal disruption? 4. What is the permissible cable length and cable grade (specs) between antenna and transmitter to make this possible? The pagers to be used are 4line alphanumeric pagers. Please note that the location is in the woods. The tallest building is about 60ft tall. The buildings are sparsely distributed and very few building exist in the location. I will really appreciate all helpful inputs. Thank you.