In this page you'll find the documentation of all rf related systems (Radio Board, Motherboard, Rocket Tracket)
with d = 60km and f = 0.866GHz we get
We can get , , from the datasheet of the rfm95w module and from the datasheet of the antennas. And we can approximate loss around 2dB each time which seems reasonable hence we get the following calculation for :
This value of seems to be fine for out use case since our receiver sensitivity is -134 dB if we use classic lora configuration, and the receiver sensitivity can go up to -148 dB which give us a lot of margin and allow us to respect our requirements that ask us to keep a 20dB margin in our link budget and compute it to be able to have a range of 2 times our apogee altitude