On the old 'raw' Watchman displays, especially when the target was close to the radar head (15 miles or less) we'd see plenty; I've passed traffic info on a flock of birds (travelling crosswind, that was the clue!), a bunch of toy helium balloons, microlights. The trouble with a balloon is that it moves with any weather returns so it's harder to interpret.
With the new processed data displays, you lose lots of that ability to interpret returns as they're all dots and crosses now!
One of the balloons that flies in our zone has a transponder and he's REALLY easy to spot now.......
