Hi Bob, of aenlic:
We used a Wilson brand Cellular antenna/booster on Foresight..worked great near- and off-shore. They come in both 12v, great for the boat, and 110v -- like the one I am about to use in my RV.
https://www.wilsonamplifiers.com/marine-boat-kits/ -- as long as you are within cellular coverage (it'll boost even weak signals).
You get the external antenna, and then use an interior amplifier... I had a 3G setup:
https://www.wilsonamplifiers.com/web...ne-kit-470311/
But I see they also have a 4G setup also. I have also attached a photo of the antenna (with threaded spikes for the ground plane)...worked Great. Call them; they give great service over the phone.