A friend has a swarm (possibly her own bees) 30 ft up an evergreen tree. Even with a cherry picker you couldn't get near them without cutting down the surrounding trees. We've put a bait hive on top of a platform ladder under the tree with some nice old black comb brood frames in. 24 hours on they haven't shifted. Any suggestions for making the hive more attractive? Haven't got any lemon grass oil and nowhere to buy any within 20 miles. Would a few drips of honey help?