Most feeders use “2 dongles in one RPi” configuration:
- One RPi with both 1090 & 978 dongles plugged into it
- dump1090-fa using 1090 dongle+antenna
- dump978-fa using 978 dongle+antenna
- piaware data-feeder, gets data from both the local dump1090 & dump978, and feeds one station.
Please see items 5 & 6 in this post