I am thinking of making a weather balloon, but I have not found a way to transmit data between the ground station and the balloon. Do I have to buy a special part? And if I do, what is the cheapest solution? I am new to this, so please don't use too many technical terms. Thank you!
For the people that put my question on hold:
This question is just asking what part I need to transmit data from a distance. It should be able to connect to the Pi.