Twice when I had high swarms to catch I had an aluminum extension ladder
near at hand.  Taking the lighter section,  I tied a 5-gallon plastic
 bucket to the top rung and, with guidance from an accomplice, positioned
the ladder a-straddle the branch with the bucket directly under and around
the swarm.  A few sharp, upward bumps with the ladder put the bees in the
bucket which I quickly lowered and dumped on my sheet in front of the
awaiting hive body.   I wish all swarms were so easy to catch, but BEE SURE
THE BUCKET IS IN THE RIGHT PLACE!!!  To be struck by a falling swarm could
be dangerous.