Never underestimate low tech
I was in NI in Feb 1985 when the IRA wiped out the canteen at Newry police station with a mortar bomb made from a steel tube filled with gunpowder. Home made weapons can be very effective.
In the context of this thread, a single AT weapon is extremely unlikely to down an aircraft. The two shot setup in the video must be treated with some scepticism.
With regards to the US Blackhawks in Mogadishu, there is an interesting commentary on the DVD made by the participants in the action. They report that the bad guys had modified the RPG from a contact fuse to a timed one and in the course of the initial action several hundred rounds were fired at the US helicopters, achieving a success rate of less than 1% by downing the two Blackhawks. Outcome political disaster for the US.
For those of you still serving - watch your backs.
EG