I work out of my travel trailer when traveling. I need good internet access. I use one of two HotSpots, Sprint and Verizon, depending on the service available.
HotSpots from inside an aluminum trailer are not very effective.
An outside antenna is the solution.
I bought a Yagi antenna from Amazone for $80
A couple of screw in PVC end caps from Lowes were attached to the side of the camper with stainless screws and 3M 5200 sealer/adhesive
Two screws in each into the wood in the corner of the trailer
Attached to these threaded end caps were two PVC saddle connectors.
A 16' aluminum, extention painters pole, also bought from Lowes, snaps right into those two saddle fixtures.
Once the pole is in the fixtures, you can rotate it to get the best reception.
And a piece of PVC with a thumb screw holds the antenna on the top. (I was going to use the handle from a paint roller, but as tight as I could make it, the wind would loosen it and it wouldn't be pointing at the cell tower)
And there you have it. The wire comes into the trailer and commects to the MiFi HotSpot and your computer or phone WiFis into the HotSpot.
I had this set up on my previous camper, but not as elegant. I simply bungy tied the mast to the ladder. Worked fantastic. Way up in Vermont, in a valley, I was the only one with internet service. I had a lot of friends that weekend!
I use a web site called "OpenSignal" to locate the cell tower around me. Be sure to access this site before you reach your final destination as you will not be able to access it if you don't have internet service!