Beginner's question. What GSM receiver do I need?

I am an absolute beginner in this subject and I would like to know a few things. What GSM receiver do I need? What antennas? How to combine the ASG-EUPOS signal? And will he find tips on how to make a diode strip to show the direction?
I plan to make a basic version for a guide without autosteering.

This is a good place to start