Fm540i
Sorry goofy and missed your comments regarding the problem. As far as the bottom end, this is a complex issue that can relate to many things, including room acoustics - probably the biggest issue, speakers, amps etc. I have heard the aerial and thought the bass very good. Wilsons bass needs little comment but can be amp dependent - their impedance does vary greatly as I understand. I have a friend with maxxs who fixed the issue with amps, having exhausted the other areas. The vertical dispersion could relate to ribbon type, some ribbons are less bothered by this than others. I use piegas which have a very different ribbon but have a wonderful vertical dispersion in my opinion. Anyway again sorry I missed the other bit