Entrance Location, Top or Bottom?

[gmcharlie]

yes,  they can use either side.   Since its 3/8 if robbing may be an issue you can use and entrance reducer.  I keep most of my hives at least 30 feet apart to minimize robbing.  I usually put it between the supers and the deeps.  the additional "space"  acts as a queen excluder.  I don't put on more than 2 supers usually,  but if I do I will add another entrance above.   The goal is to have basicly 2 seperate work forces.  honey gathers,  and brood tenders.......   and to make each groups job uncluttered.....   the hives I do this on seem to produce more brood as well as more honey,  but that may be from amny other things and I would need to set up a study to  prove it....  (not worth  it to me)      So may say that its too much open space,  but after looking at several dozens of wild hives I say baloney.....   most wild hives have 6-8 inches of open space....  some are almost totaly open.