Are there any beacons that work at long distances, say 1-2 miles?

Not much point in that. If you're 2 miles away and pick up a signal, it's gonna take you an hour to get there. Beacons are designed for when you see the guy go down in the slide and can walk the avalanche path looking.The greatest range any beacon gets is about 70 meters (230 feet or 64 yards). This comes from an analog single antenna beacon. At 40 meters a second antenna vectoring can produce accurate distance numbers and at the last 3 meters the third antenna works to pinpoint the source of the signal. Lines of induction are followed into the transmitting signal often arching from the first point of contact in. With several signals in the same area of search the more sophisticated beacons narrow their search width to eliminate overlapping of signals. The only tools that can send a distress signal a greater distance then approx. 70 meters are The SPOT and acl or epirb devices that require user activation to send the distress signal.