Don't start this argument again, Leadsled. UAT , a MITRE invention, was a solution looking for a problem to cure. Bandwidth is the enemy. You need a hundred times more ground stations to supply that bandwidth. If you are out of range, you have no bandwidth and you will see nothing. 1090es talks to anything...even out of range of ground stations...Two 1090es equipped aircraft will still see each other 200nm west of Kickatinalong! If anyone wants actual wx in your cockpit in Oz...buy an app for your smartphone or tablet. Because the government..and the airlines...would NEVER allow that type of "investment" to give GA free bandwidth.