If antennas or GNSS receivers are located close to each other, it shouldn’t influence their performance. Please note that if you plan to locate the receivers inside the UAV, you will likely need to provide them with additional ventilation.
Reach M2 receives the GPS/QZSS L1C/A, L2C, GLONASS L1OF, L2OF, BeiDou B1I, B2I, and Galileo E1-B/C, E5b signals. If you use an antenna that gets fewer signals, it may affect the receiver’s performance badly. If the antenna tracks more signals than Reach M2, the receiver will track all signals supported by its chip.
Reach M2 can be integrated with antennas that meet these requirements: