There are many threads about internet aboard a boat.
I've used boosters and single external antennas in the past and I think celluar technology has surpassed their capability.
I recently purchased a Netgear Nighthawk M1 Hotspot from a member and combined it with a Poynting Omni 402 MIMO antenna and a T Mobile plan. We connect to the Web via the Wifi Hotspot to our tablets.
Excellent results in remote areas of the San Juans Islands last summer. In some places, our tablets work better connected directly to Verizon.
The Hotspot/MIMO antenna combination made an astonishing improvement in our ability to get online while cruising away from metro areas. We were able to connect in anchorages that we were previously unable.
A lot depends on location.
We will see how we do in the Gulf Islands this summer.
I learned a lot from a knowledgeable member during my recent upgrade on posts here and on his website:
https://seabits.com/tag/internet/