Cradle point makes several 4G and 4GLTE compatible routers.
I’d recommend the Sierra wireless 313U USB air card or dongle as you call it. The 313u can accept an external antenna to boost reception and speeds. LTE is very sensitive to signal strength when it comes to up and down speeds.
Fr antennae solutions, the Sierra wireless website offers one for the 313u, but I recommend you call/ visit www.alternativewireless.com
cradle point routers are prone to excessive dns poisoning attacks threw mine in the trash....