Re: 50mb to 100mb
Which is what most people think the Superhub should be but VM skimped out to save money. There are very few non-concurrent dual-band routers in existence, and the only way the Superhub managed it is by using an el-cheapo laptop wireless card instead of a proper AP setup.
Nevertheless, if you ignore half the number of antennas and those above routers would still have four per band. I even have a single-band 54G Netgear router with 8 antennas (and the wireless range on it is exceptional, thanks Ruckus) Mind you even non-concurrent dual band should have more than 2 as individual antennas will only be optimized for one frequency and perform poorly at any other.
Ultimate® SuperHub2™ Mod©:
N750 Simultaneous dual-band wireless (300+450)
5 Upgradeable antennas, dual-processor, 7 ports
Fully customizeable dd-wrt/openwrt routing engine