Best Outdoor Antenna MR1100 Nighthawk

I use my Nighthawk with a wireless router (set up as access point) for my main home internet, as I can't get good hard-wired internet. My hotspot usually runs on band 2, but sometimes it will run on 4 and 12. Band 12 seems to be the fastest. Anyway, I want to be able to stream 4K REMUX consistently, which can sometimes require 100mbps. So, I am looking for the best outdoor antenna setup. Right now, I'm using the little black panel antenna that mounts in your window. Can someone please give me some suggestions on the best antenna and antenna cabling for me? I am about a mile and a half from the tower. I get about 2-3 bars of signal usually. Also, there is only one tower I pull from. So would I get a wideband directional? Input would be appreciated. Thanks.