you can use a ten frame deep with old comb on one frame. you can divide this in two with a solid divider.the great thing about this method is after they take well with eggs and brood just remove the divider and add more new frames that is how I caught four this yearjay
Robo has some GOOD information on them.. heres his PDF, and check his site too! http://robo.bushkillfarms.com/downloads/beekeeping/BushkillSwarmTrap.pdf http://beevac.com/swarm-traps/