Found this online :-)
Free ADS-B Equipment Offer from Flightradar24.com
Help FR24 Increase ADS-B Coverage
Are you interested in helping FR24 increase ADS-B coverage around the world?
We are looking for suitable hosts for a large number of ADS-B receivers and antennas.
We will supply the equipment free of charge and will handle shipping costs as well.
It connects directly to your router/modem by Ethernet cable.
It doesn't need a PC to run and we supply an external Mode-S antenna (38 cm), all cables including a GPS antenna for data timing precision.