I came across this the and thought it might be useful for someone.
https://www.flightradar24.com/raspberry-pi
Required parts
Raspberry Pi*
Power supply for RPI
1 GB MicroSD card 8 GB Memory card to suit
ADS-B usb dongle
Ethernet cable
*Pi24 is compatible with all Raspberry Pi devices, including Raspberry Pi Zero.
Please note that Raspberry Pi Zero has no network port and only one USB port.
Get a USB hub with Ethernet adapter and you are good to go!
As you can see you can even use a PiZero (by adding a USB to Ethernet), so the hardware requirements are pretty low.
This might be ideal for someone who has an older unit around, and is not sure what to use it for.
Cheers
Mark