Make sure the bait hive is set at least 300 ft. (100M) from any existing hive. I set one 50 ft. (15M) from my existing hives only to be fooled into watching the bees go in and out, acting like a swarm, without catching anything for two weeks.
A few drops of LGO on a cotton ball and placed in a sealed zip plastic bag will allow the scent to permeate through the pores in the plastic. Put it near the entrance. Refresh the scent every few weeks.
Bright colors only invite trouble. Not that the bees care; kids or other nosey's could mess with them. I paint mine in Woodland Camo.
Primarily swarms are looking for a dry place. Size is also a factor, but building a bait hive to 2500^3 in. (40 liters) makes for a big cumbersome trap. When you're carrying it through the trees, it makes me tired.
FRAMES. Nuff sed.