The thing with my "hotspot" is, there is no place to connect an external antenna to point at the cell tower. I intend to one day soon try an experiment where I put the hotspot at the focal point of one of my old Dish Network dishes and see if I can get better signal.
I live in an Internet desolate place and we use an AT&T "hotspot" that connects to a cell tower and is a little Wi-Fi "router" (that seems to only have one route, but that's a different rant). AT&T recently upgraded a cell tower in my area to LTE and the little hotspot connects LTE - but with only one bar. It actually seems to work though.
The hotspot does appear to have two places to connect external antennas, but I'm almost positive they're for the Wireless-N router part - not for the LTE part.