I'm not aware of a subscription...nor do I see why one would be required or enforceable as ADSB is a free service from the FAA. But I'll defer all pricing questions to the supplier: http://www.skyradar.net/.
Thanks! Walter
iFly 700 and SkyRadar combo. Where do I sign up? Can't wait!
The subscription is for the iPad application that works with the SkyRadar.